I'm on macOS Sierra and earlier today I ran disk utility and it told me that there was something wrong with the disk (it said something about exit code 8) and I should boot into Recovery mode and run disk utility there. So I rebooted into Recovery mode and started running disk utility.
Right now Disk utility has been running for 2 hours, and it's been stuck at "Checking catalog hierarchy". The mouse is frozen, and the laptop doesn't respond to any keyboard events (like changing screen brightness).
Is it frozen because it just has a lot of work todo? (I have a 500GB disk). Does this process take a very long time? Should I force reboot and try something else?