I think most seasons are between 22 and 24 episodes. The writers strike a few years back threw things out of whack and we had a bunch of like 16 episode seasons for a few years, but it seems like things have gotten back to normal. Maybe we will have more episodes next season. I am not sure how they decide how many episodes they get for a season though. I have known shows to have as many as 26 episodes, but that might be more for sitcom type shows rather then something that is more complex like ONCE.
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