Many have praised the Pomodoro Technique as a way to successfully manage time during the day. It seems that 45 minutes max is the average dedicated work time that people can successfully manage. When in these dedicated work times we are using our executive function and sometimes it can quit literally make our brains hurt. This is why having Brain breaks is so important.
Have you ever been trying to solve a problem and just can't come up with a solution? Finally you decide to step away from the project for a few minutes and then you end up coming back to it with a solution? You gave your mind a break from working and problem solving.