I know people that ride extremely long distances on platform pedals, a.k.a. "infinite float." I have had problems with them. One time I noticed my knees were hurting and realized it was because I had placed my feet on my pedals all katywumpus. I have also pedaled for 20 miles one-legged because my knee got sore on a 400 km ride and I refused to make the call of shame. I don't recommend that, saddle sores. I feel that would be difficult on platforms.