What if....

You ask a provider to join the mile high club and you fly over different time zones. Do you always fly west?

If time flies when you are having fun, do you have a terrible time to make it last longer?

To answer your question.... never haggle.

More like

If a Hobbyist books a 1 hour appointment this morning at 9:00 AM and the provider forgot to change her clock back, is the appointment already over when he gets there?

That being said ... I would opt for the mile high club going east hehe

Relativity

If you have the clock traveling at a significant fraction of light speed during the session, only an hour or so will pass on it but days or weeks or even longer will pass the two of you!  Yes, it's geek humor.

of course.  

But then there was the story of the lawyer who charged by the hour, worked round the clock and took a flight from NY to LA to have a 27 hour day.