Everywhere that I have been, it's just first come, first served.What do hotels do if the number of EVs exceeds the number of chargers? I'm sure this must have happened somewhere. Is there some policy that ensures everyone gets to charge to a certain minimum level?
Always have a plan B in case the equipment is broken or in use, especially if you expect to arrive late. If your need for a hotel charger is critical, then call ahead to make sure of their availability and possibly reserve a space. EV charging spaces at hotels are often ICE'd if the hotel is full.