Group your hard work into two periods a day and you will achieve more plus be more relaxed. The key: Concentrate intensely during those two periods.
A study of violin students at the University of Berlin found that the best players practiced no more than average players. In fact, the best players slept more and were more relaxed. But while average players practiced throughout the day, the best had one intense morning session and one intense afternoon session, and in those periods they devoted more than three times more hours to intense, deliberate practice than the average players.
Bottom line: Set aside two periods each day to focus intently on your priorities.
— Adapted from “If You’re Busy, You’re Doing Something Wrong: The Surprisingly Relaxed Lives of Elite Achievers,” Cal Newport, Study Hacks, http://calnewport.com.