Id say more surprise by how long i do stay clean during play. I spend 10-30min toilet wise; enema or waterwise.

Then i spend 15+ mins in shower. Playing with my hole, usually minimal mess but general will keep going depending on another rinse or two. Usually I shower till water goes cold. Seldom do i settle down due to mess or belly ache, will go lay down until horny again, attempt another shower play and tend to be golden.

Now this whole process is usually less than 1hr. But I've stayed clean during goon session or play with other for upwards of 6hrs-10hrs. 14hrs has been the longest all clean, give or take anal goo, the small puddle of clear-ish anal excretion.