YU-NO is a point and click game/visual novel bastard child, for me i'm about 20 hours in and now i'm on the final part, although an hour or two of that is from me having the game up in the background
if i had to guess it'd only take about 25 hours to complete for you, which is shortish for a vn
it also has a lot of women, sex scenes with every girl (even your mother), and the main character is somewhat of a pervert
the game runs on pc98 so you can just use an emulator which might run on linux (neko project II is what i use)
i can upload the HDI (rom) file with the english patch if you're interested