I don't sell that often and when I do I usually have time. I'm pretty low key and will hold a game without a deposit even if offered. I've had several out of state buyers that did come though and held the game up to 5-6 weeks. One was coming for the expo the other it took longer because when they could come I was on vacation overseas.
My thinking on a deposit if out of state is if I take it and they come and don't like the game I would give it back. I would feel bad if they travel and don't like what they see. If it's local I would maybe hold up to 7 days.