A 90-Minute Plan for Personal Effectiveness

"For nearly a decade now, I've begun my workdays by focusing for 90 minutes, uninterrupted, on the task I decide the night before is the most important one I'll face the following day. After 90 minutes, I take a break.   I typically get more work done during those 90 minutes, and feel more satisfied with my output, than I do for any comparable period of time the rest of the day."