BrothelLife

Until the money runs out.

Another interesting quote by a girl in the business. 

Until my return home flight!  ;D

KittiMinx link wrote: Until the client is spent and can't keep up with me anymore. 

Best answer to the question.  ;D

As long as you can keep it up without firing your ammo.? Or you get bored!? Whichever is longer.?

I prefer one hour parties; however, I'll reminisce about my fantastic Rachel Varga parties for eternity!

Everyone is different. Physically a couple of hours. Mentally of could be forever lasting. Just the thought of it could turn you on.
XO Vanity

To answer the question.....until you " get er done ".

When writing a book, I looked up "How many words should a book be?" 
The answer that came up was the Zen answer- "As many words as it needs to be to tell the story and no more."

That doesn't quite work with this question.  But let me try.

"Minimally more than long enough to become amazing, but not so long that it loses its thrill."

Amazing is by definition out of control so you don't get to decide how long it lasts.

As long as I can keep from going off which is not long when I’m with my ATF! Lol

Until said unit falls right off 8)