It depends how much you like to take your time reading, but for one love interest route it's probably around 3 hours? :)
whattttt so like 12 hourssss woah...
all the routes have many conversations in common (the ones in the main chat), so you could skip through the parts you've already read to get to the unique sections for each option if you'd like to cut down on gameplay time :)
Ohhhhh okay okay thanks to the u to the wow!!! <3