I always sample the half-bottle that I end up with at the end of a bottling session. If it's a full bottle, I always tell myself that it's for documentation purposes.
Having only 5 batches under my belt, I usually can only stand it a few days before I try one or two. I know it's wrong, but I can't help myself. I suppose it will get easier as I get more of a stash built up, but for now I like to call it "Quality Assurance".
Good luck and happy brewing!