I noticed my D: drive was marked as dirty and some folders were coming up as corrupted, so I recovered as much data as possible, and then scheduled a chkdsk /r /f on next restart, and I've been here since Thursday (it progressed a bit throughout Wednesday):
I now need to urgently access files on my C: drive, but don't know if I should interrupt this process with a forced power off.
unknown really, but it is rewriting the disk right now, you do risk further data loss if you do that. up to you if it is worth it.
Considering the ETA and that it's been running for several days now, I'm guessing the fixing isn't actually fixing