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I got over 4 hours out of it, but it depends on how you play. People always ask this question, but obviously the answer depends on the player. If you run through the stages and don't take the time to scavenge, look at the beautiful setting, and collect audio diaries(etc.) you could probably beat it in 2 hours. I generally look around as I play and got about 5-6 hours out of it.
It's bigger than BaS1. I would highly recommend it for the story alone though. The story is so important in fact, that you can't truly claim you've experienced the whole Bioshock Infinite story without playing it. It's not just random garbage that adds little to the story like most DLC. I purchased the season pass, so all the content was definitely worth the $20 to me.