I can easily work 8 hours per day straight, however throw two or three interruptions into my day (meetings or the like) and I'm lucky if I can get back in a sol

I can easily work 8 hours per day straight, however throw two or three interruptions into my day (meetings or the like) and I'm lucky if I can get back in a solid flow. Put me in three hours of meetings and I'm completely toast from that point on.