How to Leave the Office - Breathing Space Blog
Near the end of the day assess what more you realistically can get done and what's best to leave for subsequent days.
Recruit Others: Once you've solidly made the decision to leave on time, say on Tuesdays, every cell in your body works in unison to help you accomplish your proclamation. A natural, internal alignment starts in motion. Your internal cylinders fire in harmony with what it takes for you to have a buoyant, productive work day on Tuesday and leave on time. To ensure that you get out on time, let others know about your plans.
Strike a bargain with yourself. Suppose it's 2:45 p.m. and there are three more items you'd like to accomplish before the day is over. Ask yourself: "What would it take for me to feel good about ending work on time today?" This phrase gives you the freedom to feel good about leaving the office on time because you struck a bargain with yourself wherein you said exactly what you needed to accomplish in order to leave on time and feel good about it.
Re-strike the Bargain. Suppose you have three items on your plate that you want to finish so that you can feel good about leaving on time. Then the boss drops a bomb on your desk late in the day. Strike a new bargain with yourself, given the prevailing circumstances. Your new bargain may include simply making sufficient headway on the project that's been dropped in your lap, or accomplishing two of your previous tasks and X percent of this new project.