There is no general rule...
I've happened to bottom out at 75% in (so the remaining 25% were literally forced in), slow or fast pounding- she loved it as deep as I could give it to her. On a following conversation one thing led to another and she said that she could probably take 15% more, but more than that would feel from bad to horrible, and much more such as + 40% more she wouldn't even try it.
Would that be the same for all women? Surely not.
It's similar to clitoris stimulation- some will orgasm once and then won't take any more touching there for a while, some will only need 20 seconds to chill off so will practically take it for as long as you'll give it