Probably a long time. Controlling the models is super finicky. Hell, sometimes its damn near impossible to line up the penis again, after doing the moving around.
Its an overall decent porn simulator. No gameplay, which is nice. My wishlist for it is:
1. Better nipples (or be able to transfer the nipples from some of the other models)
2. Better breast physics (they sometimes bounce, sometimes don't at all, and bigger boobs don't have more bounce)
3. A viscosity slider (more gooey, sticky, thick or less, like precum).
4. An opaqueness slider (less see-through like water/precum and more well, opaque).
5. Auto-Alignment option (sometimes its REALLY hard to align the cock with the mouth, especially after moving either one in a direction you didn't want to, and so an option where the female tilts her head or angles it so that she goes where you want her to).