Vacations should only end after three things happen: 1) you feel rested, 2) you miss home, and 3) you actually want to get back to work. If those three things do not fall into place by the end of your sojourn, your vacation failed. That, or you 1) have health problems, 2) do not feel at home where you live or 3) hate the work you do. Vacations can help you distance yourself from your normal life enough to realize any one of these three issues and tackle problems accordingly.