Train for your first 50K
Back-to-back long runs, eating on the move, and the honest date.
From walking to 50K: 13 to 22 months, adjusted to you once you start.
How long to train for a 50K
| Goal | From “not moving much” | From “I walk” | From “I run a little” | From “I run a lot” |
|---|---|---|---|---|
| 50K | 14 to 23 months | 13 to 22 months | 11 to 19 months | 28 to 50 weeks |
The way there
- Walk. 30 minutes of brisk walking, 5 days a week.
- 5K. 5 km without walking.
- 10K. 10 km at an easy pace.
- Half marathon. A 16 to 18 km long run, with no pain the next day.
- Marathon. A 30 to 32 km long run, and a year of steady running.
- 50K. Back-to-back long runs, eating on the move.
You join at the rung you are on today. A rung is passed by doing it, not by the calendar.
The real top of the sport
| Event | Men | Women |
|---|---|---|
| Marathon | 1:59:30, Sabastian Sawe (2026) | 2:09:56, Ruth Chepngetich (2024) |
| 50 km | 2:38:43, CJ Albertson (2022) | 2:59:54, Desiree Linden (2021) |
| 100 km | 6:05:35, Aleksandr Sorokin (2023) | 6:33:11, Tomoe Abe (2000) |
| 100 miles | 10:51:39, Aleksandr Sorokin (2022) | 12:42:40, Camille Herron (2017) |
| 24 hours | 319.6 km, Aleksandr Sorokin (2022) | 278.6 km, Sarah Webster (2025) |
| 48 hours | 485.1 km, Matthieu Bonne (2025) | 436.4 km, Patrycja Bereznowska (2025) |
| 6 days | 1,045.5 km, Matthieu Bonne (2024) | 928.6 km, Stine Rex (2025) |
As of October 2026. Sources: IAU world records, Marathon records, The Running Channel.
Common questions
How long does it take to train for a 50K?
Training for a 50K takes about 28 to 50 weeks for someone who has run a half or a marathon, and 14 to 23 months from not exercising at all.
Can a beginner run an ultramarathon?
A beginner can reach an ultramarathon by climbing the ladder first: 5K, 10K, half and marathon. Skipping rungs is where most injuries start.
What is the 50K world record?
The 50 km world records are 2:38:43 for men (CJ Albertson, 2022) and 2:59:54 for women (Desiree Linden, 2021), per the IAU as of October 2026.
Written and checked by the AskDoc Medical Team. How we review. Health education, not medical advice.