I would say, even with a walkthrough, you can get a respectable number of playing sessions out of it (2-3 hours each). While still not having seen every last bit of it. I myself picked it up 2 times already, after walking away from it for a while, expecting to actually just repeat stuff and then stumble across completely unknown stuff, even new characters being introduced. I started with 13.2 and i know i have not completed it yet, damned maid events are elusive and can only be progressed once a week :D
TL;DR
Nice mixture of chained questline events and standalone rng single events to discover. Not to mention there is an update droping the next week or two, according to the Patreon announcements. Which is for me personally a really exciting thing i look forward to.