I had never thought that after graduating I would be working 9-5. It wasn't my thing either. At some point, I took part in teaching in university, where actually it requires to work more than 8 hours a day; couple hours teaching, then you have to do some counseling, some researches with number of research group and so on.
Sometime I feel so fed up about this routine that I took few days off before restarting everything. What make me stay in the job is because there are so much fun working with the youngster, teaching is actually way of learning for myself too. When they - my students- accomplish something, I feel prouder than they are, I guess :D
But then you have to make sacrifices : load of dirty laundry that you could only do it at night or even once a week, less time for cooking - which I enjoy much , less time for leisure with my family, unless I am really well manage my time, which still far from perfect
RE: Why are you working 9-5?