Can you end Beast Form early?

One hour of waiting in Skyrim is approximately equal to 180 seconds (tested using shout cooldown times - a 180 second cooldown was ready after waiting 1 hour, while a 300 second cooldown required me to wait for 2 hours). As your time as a werewolf is equal to 150 seconds + 30 seconds per "feed", if you've fed on a large number of bodies in werewolf form, you may need to wait several hours.

I have also noticed that the check to see if it's time to turn back to normal appears to be run only every few seconds, so you may need to stand around for a moment after waiting in order for the transformation to occur.

I found just using the wait function for a quick hour to be the best, so once you clear a room just tap the select button or what not and once your in game hour has gone by you'll be your naked self pretty quick.