10k. And at the latest with the first event you could reach Twins.
They deviated from their previous rythm already. So all bets are off.
From a design point of view, they could align it to an arbitrary reset bonus * max warp bonus, what you would need to complete the last girl in weeks instead of millenia.
Depends on how long you want to wait. The difference between those values is a x2. So if you would need 1 month with 300 you would need 2 month with 150. Actually slightly less, since you can level your money buildings.
But even with maxed out buildings, the porn market only makes 1.4T/hour per 1M game bonus.
I cant remember exactly. But it was around 1 month I needed with 200M to complete Anya.
I wonder if they will up the skills in a way that they are harder to farm than the money. Or rather adjust the requirement of new girls.