Those numbers are somewhat misleading. If you leave the AH tab open, even when on the web somewhere else, it will add 15 minutes to your time. So every time you come back to check on something, 15 minutes will be added on even if you were only peeking for a second. I'm rather surprised my time is that high because I'll go days on end without even turning my computer on.
I have 12 days 6 hours and 34 minutes but I have a tendecy to leave the tab open while I'm doing other stuff.