We have a quarterstaff (bo in other parlance) which is 6 feet long.
This is what the UK are recommending as physical separation.
There is a temptation (*tiny*) to use it as a way of nudging people back that get too close. Assume you are about to get a whack on the head, now step back so it cannot happen. Good, now that is the right distance. 😝
Actually, people around here are mostly being good, mistakes are just because we are all figuring stuff out and correcting it good naturedly.