Hard to give an exact number, but I’d guess around 50 hours total—though I accidentally left the game running for a few hours a couple of times.
For the church area bugs, I put together a folder with the videos I recorded of all the wall clipping spots I found and remembered:
Driver Link
Overall, I really enjoyed the game—even with those few hiccups! One thing I’m curious about, though: how do I remove the chastity cage? I finished Daddy’s quests and Beatrice’s quests related to it, but when I check the status screen it still shows the cage, even though none of the text mentions it anymore.