I'm 24 and I have mild face acne (just the occasional pimple, rarely more than three at a time) but I have pretty bad back acne. I've always played sports and usually when I played sports growing up and going to practice, I would wait about 4 or 5 hours between finishing practice and taking a shower (I would finish practice at about 6PM then wouldn't shower till I finished most of my homework at about 10PM or 11PM). I suspected this might have been a contributing factor to my back acne.

I never did anything to treat the back acne, but I am considering the bacne regimen. However, in my current situation (living in rural Japan) my gym does not have a very good shower. They are kind of grungy and don't have mirrors. I usually go to a traditional Japanese bathhouse (onsen) which has a big communal bath, steam room, and showers. This is where I would do the regimen (along with the face regimen). However, I would most likely be finishing at the gym about 6PM and then not going to the bathhouse until 9PM.

Will this wait time between working out (and getting sweaty) and showering diminish the effectiveness of the regimen? Should I do a quick rinse at the gym shower? Does the lag time between showering and exercising not actually matter?

Would the hot bath and steam room have any positive or negative affects on my acne?

Thanks in advance for the help!