First off, 1 week in primary seems to short. Yes, it's probably finished fermenting, but the yeast are still working, and you removed the beer from the yeast.
Next; are you secondarying in glass or plastic (based on what I've read, you can consider better bottles similar to glass). If it's in glass (or BB), you can leave it as long as you like provided you keep the airlock full; a year if you like. I had one I left for 4 months because I just didn't get around to bottle. Tasted great. If using plastic, the concern is for oxygen permeating the plastic and slowly deteriorating the beer, even then, a couple of months should not be a problem.