Vacation Glow

How long does it take one to lose the glow, the feeling of refreshment after being on vacation?

I don't know exactly at what moment the vacation glow completely vanishes. It appears that it is a cumulative affect that occurs after getting one task after another at work. The glow fades so slowly that makes it almost imperceptible to pin-point the rate at which it is fading. I returned to work last Tuesday and by Friday it seemed like I had never been away.

It is unrealistic to believe that you can sustain the vacation glow indefinitely. I understand that the true value of a vacation is the opportunity to take a step outside the day-to-day routine and look at life with greater perspective.