One of the problems with being used to working in the lab is when you cannot (because of teaching, money issues, meetings) it is hard to judge your day. I actually finished the tasks I had in mind for the day and am kind of thinking what should I do for the next hour. I hate wasting the time but I am tired having read for most of the day, had one meeting, went to an equipment show. I would feel terribly guilty if I went home early so I will do some general stuff for a while to avoid getting down on myself.