Never played this (saw the abandonned tag). If I got this, approximatly how much game time is there?
You have the main three girls in the house; Linda, Sara, and Caroline.
Caroline is the only one in the game right now with a near complete route with 5/5 points. I "think" Sara is 3/5 and Linda 4/5.
The woman who basically starts this game off, Mrs. Celia, is the MC's teacher and the one that starts him on this whole sex escapade. You can get pretty far with her too to the point where she changes her attitude.
There is a lesbian couple (the MC's "aunts") that you can also get involved in a few times, plus there a lesbian "couple" next door to the MC that you can't participate with, but only watch. Any other girl is just game filler or "one-offs" at this point.
Caroline's route (older "roommate") is the only route that's near done, and in my opinion, the best thing in the game. You have the undersexed, unsatisfied "landlady" (Linda) and the youngest "roommate" (Sara) who's sexually curious.
If you do the whole game, you can have several hours of playtime. If you go single routes, maybe a couple of hours, if that.
I suggest Lain's Walkthrough Mod if you play it:
https://f95zone.to/threads/milfy-city-lains-walkthrough-cheat-mod-v0-6e.41364/