Well I did 30km with ~1500m height gained three-four times a week for a while. If I pushed I maybe could do 60km, but that would be no fun. Tops was 40 km on tr

Well I did 30km with ~1500m height gained three-four times a week for a while. If I pushed I maybe could do 60km, but that would be no fun. Tops was 40 km on trails and 2500m gained, but that was extreme. You need enough water, good shoes and nice weather for that. Or a flatter terrain. On flats, 20km takes ~3.2 hours and yes you can walk 60 or 80 in a day and not drop dead at the end of it if you take care.