| David Haffeman's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| 2026 Running Up For Air (SLC) (12H) | Colorado, US | 43 | Saturday, February 7, 2026 | 09:47:08.00 |
| 2024 Sawatch Ascent 50k | Colorado, US | 41 | Sunday, September 29, 2024 | DNF |
| 2024 West Line Winder Trail Races (50k) | Colorado, US | 41 | Saturday, September 28, 2024 | 06:29:11.00 |