Long IM Shifts (a tad whiny)

I don't know about anyone else but when I have an IM shift that lasts longer than 2 hours it drags on and on and.....

This is my four-hour shift today and already I've visited the little librarian's room twice, grabbed some delicious butter cookies for a snack, and drank all of my green tea. I still have an hour and a half left.

I think my optimal IM shift is 2 hours. Does anyone else have any feelings on this?