Really took my time playing and got all 4 endings in about 3 hours. You probably don't need to dedicate that much time to it though, since if you're playing this game, you're here for the NTR endings. I did my first playthrough protecting Momo, trying to get the "best" ending, so that i would appreciate the differences in dialogue and events once i got her prostitution count up on the 2nd playthrough. Instead, doing this removed some of the mystique of the game during the more exciting route, since i had already seen everything once. Since there's not a ton of substance to the game, it had overstayed its welcome for me by the end. Therefore, I recommend you do not hesitate to whore Momo out, and get right to what you came here for. Just be sure to check the bedroom and bathroom scenes at every opportunity from the beginning, so that you can notice the progression as you go along. There is an optional final boss, but it is evident that you have to grind the combat for way longer than I'd be willing to in a porn game in order to beat him. I don't know what you get for doing so.