Great question, it shows your aim is on winning the marathon not the sprint. I agree with most of the advice in this thread. For us, it came down to putting a boundary around our work hours, in my last three companies there were never boundaries and we had what we thought were sweet benefits like "take as much vacation as you want" but really it just meant longer hours before and after your time off. We did an experiment called "40 Hours a Week No More No Less" testing to see if we could meet current responsibilities, stay profitable, and beat the competition. That experiment turned into a company policy three years and has been one of the most influential things we have done as a company. There isn't enough room to provide the full background but in short, by setting boundaries around our work hours it actually increased efficiencies and created a hyper focus on prioritizing the right work each week. You can read more about it here: http://neversettle.it/actual-40-hour-weeks-in-a-startup/