I keep my mask on my face until I am back in the boat. I don't rinse my mask until the boat is stopped or nearly so, and when I rinse it I wrap the strap an extra time around my wrist. I don't put it down around my neck or backwards on my head like I have seen others do because I don't want to risk fouling up my defog.I see a lot of divers pull their mask up on their forehead after surfacing and clearing out their nose etc. I always pull mine down over my neck. Probably due to my beach training, easiest way to lose a mask is by having it above your face.