The rule in FAA-land is F410 which does affect bizjet operators. We're trying to change it, but it doesn't effect the airlines, so the FAA isn't interested.
Oh yeh? Most private biz-jets most likely do what they like: or file FL410 as max.
To those who say the quite regularly deploy the O2 max and re-stow it; I salute you. It has never been a teaching point in nay of my TR courses. I learnt how to do it using initiative & an engineer. IMHO a quick poll of those who know how to re-stow an O2 mask would show a very small %. Surely, if there is a need to use and re-stow then crews should be instructed how to do so.