For those who aim to be highly productive, there is a law called Parkinson's Law that can improve output dramatically in a shorter allotment of time.
The law makes use of time pressure and is as follows:
An individuals output increases in direct proportion to the decreasing amount of time given to a task.
When facing a deadline, output of work can rise almost tenfold; increase of focus and reduction of time wasting behaviours is responsible for these outcomes.
To do more, allow less time to do so.