In my camp it depended upon the number of staff assigned to a program how many people could take time off at the same time - if we had 4 or more counsellors then 2 could but any less than that then only one person could take TO at a time cos we had to have at least 2 staff with the kids at all times! Or if as session you are only staff assigned to a HUGE group of 4 (and then 3 cos 1 of them left) campers - you were supposed to be in places were there were other staff. When my kids went for showers I had to take a walkie talkie with me incase there was an accident and I needed to go into the shower so that I could radio for someone to come up so that I wasn't going in alone!