The 20-mile march is a myth (and it doesn’t matter)
Why sustained curiosity beats AI sprints
Jim Collins’ “Good to Great” is probably the most quoted business book of the last 25 years. One of its most famous ideas is the “20-mile march” — a parable about sustained discipline beating heroic sprints. The story goes like this:
In 1911, two teams raced to be first to the South Pole. Norwegian Roald Amundsen marched exactly 20 miles every day — no more in good weather, no less in bad. British Robert Falcon Scott pushed hard on good days and collapsed on bad ones. Amundsen won. Scott died on the return. The lesson: be consistent. Set a pace you can sustain. Don’t sprint.
It’s a powerful story. I believed it for years.
Then I went to Dundee — we have an Opera office there — where Scott's ship, the RRS Discovery, is permanently docked as a museum. I stood on the deck. Cleaned it, actually (long story). Stood at Scott's desk and tried to imagine what curiosity and drive a person needs to feel to set off on a 1,000km trip into the Antarctic.
And when I dug into the real history, the parable fell apart.
Scott didn’t lose because he lacked discipline. He lost because of specific, falsifiable decisions. He chose ponies over dogs — despite Fridtjof Nansen personally telling him “dogs, dogs and more dogs.” Ponies sweat through their skin; in Antarctic conditions, the sweat freezes and the animal dies. Dogs cool through panting. Scott’s daily rations provided under 4,500 calories. Man-hauling burned 7,000. On the plateau, 11,000. Amundsen’s team reported gaining weight during their expedition. And Amundsen didn’t march a steady 20 miles — his diary records full rest days, multi-day storm stops, and deliberate pace changes.
The “consistent daily discipline” lesson is a retrofit. A story that survives because it’s compelling, not because it’s accurate. Change “Antarctic expedition” to “startup” and the lesson survives unchanged. That’s a sign the explanation isn’t doing real work.
So the myth is wrong. But I bet even after reading this, you still believe in it. I do :) Belief perseverance in action. The 20-mile march still works as a mental model. Not because of the history. But because we intuitively feel it’s true.
And science is actually on our side. Just not Collins’ version of it.
The spacing effect is one of the most replicated findings in psychology. Distributed practice — spreading learning over time — outperforms massed practice by 10–30%. This isn’t opinion. It’s measured across hundreds of studies. Your brain consolidates learning primarily during the gaps between sessions, not during the sessions themselves. Nine hours straight is worse than one hour across nine days. Not slightly worse. Measurably, significantly worse.
Ericsson’s research on deliberate practice found something most people misquote. The famous “10,000 hours” gets all the attention. The part that matters more: elite performers top out at roughly 3-5 hours of focused practice per day. After that, quality drops off and diminishing returns kick in. Not because they lack motivation, but because their cognitive systems can’t sustain the required attention. The violinists who practiced 4 hours and napped outperformed the ones who practiced 8 hours and pushed through.
Spacing means the gaps matter more than the sessions. Ericsson means there’s a daily ceiling. The sprint pattern violates both. The march pattern respects both. One thing, one hour, every day. Gaps between sessions. Well under the ceiling.
I think about this standing at Scott’s desk. He wasn’t lazy. He wasn’t undisciplined. He was a genuinely brave, capable leader who made specific wrong decisions under uncertainty. The lesson isn’t “be more consistent.” The lesson is: preparation beats heroism. Specific decisions beat generic discipline.
Applied to AI: the landscape in six months won’t be the same as today. Half the tools you’re sprinting to master will be replaced by something better. The person who spends one focused hour every day will have compounded more than the person who burned out in week three. Not because consistency is morally superior. Because the brain has specific constraints on learning and attention — and effective strategies work within those constraints rather than pretending they don’t exist.
Don't let AI FOMO fry your brain. One focused hour a day is enough — not nine-hour sprints, not weekends lost to exhaustion. Pick one specific question you're trying to answer. Write down what you learned. In six months you'll have compounded more than the person who sprinted and crashed. The AI landscape will have changed twice by then anyway.
And leave time for the things that actually matter. The close ones. Good food. Life. No model update is worth missing that.
The march doesn't have to be 20 miles. It just has to be daily. And you still have to be walking in six months…
PS. Enough is enough. “—” is beautiful. Option+Shift+’-’. I’m on Opera Neon, and adding em dashes with wild satisfaction where I want them, despite the rants of ChatGPT “lovers”.
Appendix: what actually happened in Antarctica
For the curious. Skip, or stay — choice is yours.
Scott’s cascade of specific failures
The ponies. Scott brought 19 Manchurian ponies, 34 dogs, and 3 motor sledges. The ponies were purchased by Cecil Meares — a dog expert, not a horse expert — because Captain Oates couldn’t join until May 1910. Upon seeing them, Oates reportedly called them “the greatest lot of crocks he had ever seen.” Of 19 ponies, 9 were lost before the polar journey began, several drowned on disintegrating sea ice. Ponies required warmer weather to travel, forcing Scott to delay departure until November 1st. Amundsen left October 19th, an 11-day head start. And as mentioned already — ponies do sweat.
The motor sledges. Scott invested heavily in motor sledges — spending roughly seven times more on them than on dogs and ponies combined. In practice, the technology proved unreliable... The first fell through thin sea ice during unloading and sank. The remaining two failed after covering just 50 miles in 7 days. Worse: Scott had left behind Lt. Cmdr. Skelton, the engineer who designed the sledges — all due to a rank protocol dispute. He lost irreplaceable expertise over a personnel squabble (yes, facepalm).
The caloric miscalculation. Scott’s daily rations provided (by most estimates) under 4,500 kcal/day. Man-hauling burned approximately 7,000. During plateau ascent, 11,000. A daily deficit of over 2,500 calories. In contrast: Amundsen reported his team gained weight...
The fuel tins. Scott’s kerosene was stored in tins sealed with cork stoppers and leather washers. Fuel crept past imperfect seals and evaporated. This was already a known phenomenon from previous expeditions. When returning parties opened cached tins, they found them partly empty: no fuel meant no melting snow for water. Amundsen soldered his tins shut. A depot he left was found 50 years later, still full.
The clothing. Scott’s team wore woolen underwear with windproof outer layers; sweat froze inside during heavy man-hauling. Amundsen’s team wore loose-fitting Inuit-style furs allowing air circulation.
One Ton Depot. Planned for 80°S but placed at 79°29’S — 35 miles short — because the ponies were struggling. Oates urged killing the weakest for dog food and pushing on. Scott refused: he’d had “more than enough of this cruelty to animals.” Scott’s party died approximately 11 miles south of One Ton Depot.
Amundsen’s specific decisions
Dogs as a system. 5 men, 4 sledges, 52 dogs. Paced deliberately — daily mileages kept shorter than necessary for 75% of the journey, with up to 16 hours/day resting. At the top of the Axel Heiberg Glacier, 24 dogs were deliberately killed. Their carcasses were eaten by remaining dogs and men. This provided fresh meat and helped supplement the team’s nutrition, contributing to better overall energy and health. Fresh meat also contains small amounts of vitamin C, which likely helped reduce deficiency risk.
The depot-marking system. Each depot had bamboo flags every half-mile for 5 miles on each side — a 10-mile-wide safety net. Each bamboo was numbered so the returning party could determine which side the depot lay on and how far away. Scott’s depots had a single flag.
Superior nutrition. Amundsen’s pemmican contained oatmeal and peas — providing fiber, B vitamins, and some vitamin C. His biscuits used wholemeal flour, oats, and yeast. Scott’s used plain white flour. Amundsen’s daily rations: approximately 5,000 calories plus food from killed dogs.
Lighter equipment. Olav Bjaaland planed down the sledges by roughly one-third. Amundsen used a sextant (light, simple); Scott used a theodolite (heavier, more complex). Four of Amundsen’s five men were qualified navigators. Scott had one per team.
Skiing. Amundsen's team grew up on skis. They also had Olav Bjaaland, a champion skier. Scott hired Norwegian Tryggve Gran to train his men, but never made it compulsory. His own diary entry says it all: "Skis are the thing, and here are my tiresome fellow countrymen too prejudiced to have prepared themselves for the event."
The weather
March 1912 was unusually cold. Susan Solomon and Charles Stearns (PNAS, 1999) provided the definitive meteorological analysis: during Scott’s return, temperatures were far colder than normal — on some days, minimums were more than 11°C colder than the climatological average. Only 1 year in 15 showed similarly persistent cold. Bad luck was real. But Amundsen’s margins were so wide that similar conditions would likely not have been fatal for his team.
Amundsen's own words crystallize this: "Victory awaits him who has everything in order — luck, people call it. Defeat is certain for him who has neglected to take the necessary precautions in time; this is called bad luck."
If the Antarctic history hooked you, check this one: Roland Huntford, The Last Place on Earth — the definitive dual biography of Scott and Amundsen.