Great advice:

One pattern to help yourself fight the mad dash for the mirage of being done is to think of a good day’s work. Look at the progress of the day towards the end and ask yourself: “Have I done a good day’s work?”

Answering that question is liberating. Often, if the answer is an easy “yes,” you can leave your desk feeling like you accomplished something important, if not entirely “done”. And should the answer be no, you can treat it as an off-day and explore the 5 why’s.