In my experience, being a casual player, 36 hours is a short time to complete all my leves. I would certainly be in favor of increasing it to 48. To the hardcore that finish everything in a few hours, I can only sympathize. However it is, someone will be inconvenienced until they give us all more to do. But after that arrives, it would certainly make more sense to increase the leve reset. How could anyone enjoy new content if there is no time between leve resets to do it?