I think it should be shorter than an hour -- 10km is 6.25mi. I can easily walk at a 4 mph clip for a long time without getting sweaty or tired. 10km on a flat b

I think it should be shorter than an hour -- 10km is 6.25mi. I can easily walk at a 4 mph clip for a long time without getting sweaty or tired. 10km on a flat bike path should not take more than 25-30 min. Maybe add 5 min for traffic lights if there are many.