- Who
- CJ Albertson
- What
- 2:38:43 hour(s):minute(s):second(s)
- Where
- United States (San Francisco)
- When
The fastest 50 km ultra distance by a male is 2 hours 38 minutes 43 seconds, achieved by CJ Albertson (USA) in San Francisco, California, USA, on 8 October 2022.
Albertson was competing in the Ruth Anderson Memorial Endurance Run. His time is also recognised as World Athletics’ 50 km (31 mi) road run record.