Probably about four weeks for the primary plus another four to lager out. I tend to let my lager yeasts sit a little on the warm side for the first day or two to let them feed, reproduce and burn up some oxygen before lagering them down to the 50's. The cooler your fermenter is, the longer it'll take to lager.
Lagers require a lot of patience. I'm sure yours is fine, just give it time.