question, how far each route goes? (In days)
If you're talking about the current build, Brendan's route goes up to Day 6, Kamil's route goes up to Day 2 in the Patreon build and up to Day 1 in the current public build, and the rest of them go up to Day 1. You can go through part of Day 2 in all of the routes but it's mostly the same apart from some dialogue changes, and it stops midway in all routes except Brendan's (and Kamil's in the Patreon build).
If you're talking about the final release, I have no idea. My guess would be 15-18 days but that's not final.