yesss everydayyy. having to reapply it can be annoying. you can try suncreen sprays for convenience. I use suncreen lotion as the base + spray to reapply

Well, I put it on almost every day, because it's part of my makeup routine, so I don't use it when I'm staying home (_　_|||)

"everyday is everyday" as said by lan wangji, albeit in a different context.. cough.
as long as it's a light sunscreen you get used to it after a while if you mix it in a daily routine with like brushing your teeth in the morning or smt

Almost never, with the exception of vacation/going to a lake