I don't bother with a hydrometer reading, but I leave my brews for two or more weeks in the primary. When the kegs are empty from the last batch, everything moves up. I haven't had an unfinished batch yet but the theory is that if it hasn't finished after two or three weeks, it's stuck. The act of transferring should cause it to fire up again. I don't keg until about 5 - 6 weeks in.
If you can't fix it with a hammer, you've got an electrical problem.