Yeah, according to the setting it should only log you out after 3 hours of INACTIVITY, and it should reset the inactivity timer to zero each time you make an interaction with the application.  HOWEVER, just like so many issues with this software, the programmers have failed to implement this feature as described and it simply logs you out after 3 hours since you most recently logged in.  This has been bugging me lately.  It's 11AM where I am now, I have not been INACTIVE since 8am, I've been working in and out of QBO, however 8AM is approximately when I logged on - and lo' and behold: I've just been logged out when returning to the application.

This setting is not only annoying, even if implemented correctly a 3 hour timeout is much to short for those of us who spend most of our day using the application.  At least offer additional 6, 8, and 10 hour logout intervals.