In an 8 hour day I can do 5 hours productive programming, using the pomodoro technique in 4x30min blocks followed by a 30min break. Keeps my head focussed and f

In an 8 hour day I can do 5 hours productive programming, using the pomodoro technique in 4x30min blocks followed by a 30min break. Keeps my head focussed and fresh all day, and I'm not wiped out at night. There's a huge difference in my productivity on days I strictly follow pomodoro and days I just continue programming until I literally need a break. Edit: I charge 1 day for these days. I get more than a days work done compared to other people in the office, so I feel it's fair.