I leave about 6-8 inches as well, for weaving in. I do like to leave about 1/2 an inch after cutting off the woven-in yarn, because mine seem to poke out the front eventually if I don't. Clearly suzeeq is better at weaving in that me! :teehee:
One thing I just tried today when weaving in yarn on a dishcloth was to weave in most of the yarn as usual, then when I just had about three inches left, I split the four-ply yarn into two sections and wove those in separately. That worked much better and doesn't show at all. It's much less lumpy!