It can be OP, especially when , like you said, you have limited periods when you can hobby.
What's much more frustrating is the provider lets you drive to their incall and when you arrive you get the text saying " getting in the shower now ".
It's my New Years resolution to never request from a ncns artist again - shit happens and they reschedule, that's 110% different and understandable.
I had a 10 AM this morning where the appointment was made 2 days ago. She was 30 miles away from me and I showed at 10 AM sharp and I was in her incall in less than 5 minutes. It never entered my mind to be anything but on time and I'm sure she thinks the same way. That and other things is what keeps us having many meetings -

That's the way it should work most of the time.
The half hour sitting in a parking lot and no communication - NADDA !
Here's a doozy for ya' !
Early last year, I schedule with a provider and drive to her incall, text her right on time " I'm here " - response - Nothing !
I wait a bit and then a text comes in " give me 5 more minutes, he's putting his pants on now and gettin' ready to leave. He's old and it took him a long time to cum ! "
Shit, even I broke up from that comment ! Have to admit, that's some kind of funny !
Guess who wasn't in the parking lot 5 seconds later ?