Sub-24 at a 100-mile race is a meaningful threshold. It earns you the silver buckle at Western States and Leadville. It separates "trained" finishers from "trained-and-fast." And it's mostly a discipline test, not a fitness test — most runners with the fitness to break sub-24 don't, because they make one of three pacing mistakes.

The math: 14:24/mi average

Sub-24 hours over 100 miles averages 14:24 per mile. That sounds slow until you remember it includes:

  • Every aid station stop
  • Every climbing-pace mile
  • Every walked uphill
  • Every dark-of-night moment of self-doubt
  • Every gear change

"Moderate effort with no major breaks." That's the sub-24 equation.

The pacing curve that works

Miles 0–30: Easy

11:00–12:00/mi pace. This should feel insultingly easy. You're holding back. You'll be passed by runners doing 9:30 pace; let them. Most of them won't finish. Those who do will not be ahead at mile 80.

Miles 30–60: Steady

13:00–14:00/mi pace. The race is starting. Eat constantly. Hike every steep climb — running flat-pace climbs costs more than it gains.

Miles 60–80: Honest

14:00–15:30/mi pace. This is where the race lives. The runners who held back early are picking up positions. The runners who went out hot are walking the descents. Stay disciplined; eat at every aid station.

Miles 80–100: Mostly hike, run when you can

15:00–17:00/mi pace. Walk the climbs. Run the descents and flats. The buckle is earned in this section. A sub-24 finish often means hiking 30% of these last 20 miles — but hiking them aggressively, with intent.

Aid station discipline — the hidden 30 minutes

Six minutes at twelve aid stations is 72 minutes. That's an entire hour of your sub-24 budget. Cut it to three minutes per stop and you save half an hour. Crewed runners save more.

The aid-station NASCAR pit-crew protocol:

  1. Crew has chair, food, and refilled vest ready when you arrive.
  2. Sit immediately. Don't ask for what you want; crew hands you food.
  3. Eat while crew refills bottles, restocks pockets, replaces socks if needed.
  4. Set a 4-minute alarm. When it beeps, hand back vest, get up, walk out.
  5. Run the first 100 yards out of every aid station — not to be fast, to remind your legs how to run before the next mile.

The training week that produces a sub-24

Most sub-24 finishers peak around 80–90 mpw. That's not "100-mile training weeks." Volume matters less than:

  • Quality long runs at race pace. Build long runs to include 8–12 mi at goal race pace (the 14:24 average). The body learns the pace.
  • Vert specificity. Train on grade similar to the race. Western States hopefuls do 1,500+ ft/wk vert. Leadville hopefuls add altitude.
  • Back-to-back long runs at the peak. 28/16 (44 weekend miles) is the workout that makes sub-24 possible.
  • Race-pace work in week 14-16. One workout per week at goal race pace, building from 60-min to 90-min sustained efforts.

The single mistake that costs sub-24 attempts

Going out too fast. Most failed sub-24 attempts had the fitness — they just hit mile 30 in 5:30 (a 11:00/mi pace) when the conservative target was 6:00 (12:00/mi pace).

That extra 30 minutes "in the bank" is borrowed against your back-half. The runner doing 11:00/mi for the first 30 will fade to 16:00/mi or slower in the back half. Net finish: 25 hours.

The runner who held 12:30/mi for the first 30 (50 minutes off the leaders' pace) and held 14:30/mi for the back half (passing 30 people) finishes in 23:50.

Same fitness. Different race. The pacing decision in the first hour determines the buckle.

The mental game

Sub-24 is a 24-hour solo discipline test. You're talking yourself in and out of decisions every mile. Three rules:

  1. Trust the watch. Wear a sport watch with a target-pace bar. When you're "ahead of pace," let yourself slow down. The watch is right; your feel is wrong.
  2. Don't chase passers. Especially in the first 30 miles. The runners passing you at mile 12 are not your competition; they're showing you what not to do.
  3. Run from aid station to aid station, not from start to finish. The race is a series of 5-mile segments. Each one has its own pace, its own focus, its own goal. Sub-24 happens one segment at a time.

The buckle is real

The silver sub-24 buckle at Western States is heavier than the bronze. It hangs differently. The runner who earns one this year will tell you it weighs more than the buckle from their 2-hour-slower finish three years before.

It's a small thing — a piece of metal. But the discipline that earns it transfers to the rest of your running career, and to most things in your life. Sub-24 isn't athletic; it's executional. We hope you earn one.