Beautiful answers by the ladies so far.
Yeah, pretty much just keep going until I can't handle the sensation anymore nudge her away.
Even then, feel free to steal a couple more bobs, just to make sure I'm really done.
On the opposite end of the spectrum, nothing's worse than a woman who doesn't know how to finish a guy off properly. Back in my younger days, typically in AMP's, but other scenarios, too, you get those idiots who want to vice grip and speed up like a fucking jackrabbit!! Fucking Christ...talking about shitting on a mood. Here, you're getting more rub burn than orgasm. Then they don't want to let go, thinking the shit feels good. Noooo, I'm pushing you away because you're fucking doing it grossly wrong.
Once the tingle starts, you don't need to speed up and grip tighter. Fuck!!