...even if the session had plenty of time left. Most good providers allow as many pops as you can muster during the paid session time, and don't require extra gifts or tips for this.
But yes, if it's a question of him going overtime, by all means, don't let him work that game. This is the most uncool move a hobbyist can make, IMHO, trying to stretch session time. I'm in 100% agreement with you Dez, if he can't finish another round in time, and goes over, he's on the hook for that time.
Guys: don't abuse her generosity. OK, you have maybe 1-2 minutes of grace period, but once you start pushing past 3 minutes, that is extremely poor form, bordering on rip-off. If you were to prorate it, and the meter was running, even a few minutes means real money. For a CC hour, 6 minutes = $20.00.
Also, you know your johnson better than anyone, if you know it takes you 20 minutes to get your hose to spray, and you only have 12, don't get started, unless you have the money in your pocket. If you don't, have her give you a backrub, cuddle, or chat and save your baby juice for next time. It's just wrong to take up her time without compensation, I don't care how "into it" she seems. If you go over, do the right thing , at a minimum, offer, if she declines, insist, if she still declines, thank her profusely and be very humble. She just gave you a gift.
iceman