I am new to this hobby, but I have done some research on my terminology.My question is, I have booked a multiple hour session, can I make the assumption that I will be allowed MSOG?

There are many reviews that talk about MSOG in a one hour session (for you young'ins.)

Just don't finish the first shot ten minutes before the session is over and expect her to wait thirty minutes or whatever until you are ready.

In other words, be cognizant of the time.