[sankumsek]

Wouldn't this be better if we just picked the hour record for running?[1]

Coincidentally it's right at 21km/hr! :)

1.https://en.wikipedia.org/wiki/One_hour_run

[inasio]

I tried to find similar distances to compare, but it might have been better like you suggested to compare around similar times. One other thing is that the conditions in an indoor velodrome are pretty ideal vs being in the water, although you also can get currents and wind (although records cannot be certified unless winds are below some threshold I believe)

[andrewem]

The half marathon record is 57:31 for 21.1km, so it’s not too far off.

https://en.m.wikipedia.org/wiki/Half_marathon_world_record_p...