Your productivity returns will diminish EVEN IF ur not quite done w the thing ur workin on... (maybe even especially) If you REALLY wanna be efficient, Dont forget how IMPORTANT it is ...to take small breaks along the way P.S. A break is doing something INTENTIONALLY unproductive, fun, and/or relaxing. Partying at a club? Not a break Lying down in a meadow of flowers looking at the sky? Thats a break