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It depends very much on your playing style. If you use starting boosters like I do and try to stay on a top win streak then some levels in the 700-1500 range can be passed in just one or two moves. Generally I can play one level in about a minute, but I only play one episode at a time. I'd say if you are playing for speed only you can do 100 levels in an hour if you play very fast.
Time from sitting around doing nothing of course. Don't we all have these moments when we have nothing to do? As for me, I play while watching something on the TV that isn't that engaging that I have to pay attention. Or in between tasks of housework. For half an hour. I am retired, so I guess I have more time than some others.