It gives you time for genuine discovery. Burn out, if you've ever experienced it, is not about exhaustion. It comes from forcing yourself in one direction so long that you forget all of the other things that are fulfilling to you. It takes time for all of those old desires to percolate up to the surface where you can recognize them now that you're no longer focused on that one thing. A month is great if you're balanced but exhausted and need a vacation since you're not trying to change your thinking habits. It just takes longer to recover from burn out because changing your state of mind is exactly the point.