Depends on whether he's at home or traveling among other things. At home a provider is less likely to be busy although busy days do happen.
Also many providers would rather not cum in order to save it for a potential client or a hookup later. Some simply refuse to do it for a 1 hour appointment which is logical.
We had an escort who doesn't post anymore who used to claim about having five clients a day on a trip on average while at the same time talking about going to restaurants for breakfast, lunch and dinner.... Hard to believe but I am sure days with five clients do happen especially on a trip.