My 11-mile commute takes about 35-45 on the way in and 40-60 on the way home (accounting for downhill vs uphill and the tendancy to have a headwind in the afternoon).
But then, my route is pretty flat and I've got a mostly-empty MUP for 7-8 miles of the trip. YMMV.
40-60 minutes is a good amount of time to budget for.