Every PBP has a bunch of vedettes that race to be first. There's no official 'winner' of the ride, but someone has to be first and they do give out trophies.
As for equivalent distance for runners? I'd agree that it's more akin to long distance walking. So id'd be roughly the same as doing long distance walking events where you are walking for up to 18 hours a day for 4 days.
http://www.paris-brest-paris.org/pbp2011/index2.php?lang=en&cat=presentation&page=competition_ou_rando
Every PBP has a bunch of vedettes that race to be first. There's no official 'winner' of the ride, but someone has to be first and they do give out trophies.
As for equivalent distance for runners? I'd agree that it's more akin to long distance walking. So id'd be roughly the same as doing long distance walking events where you are walking for up to 18 hours a day for 4 days.