Its hard to base results on "an average night," but if you are averaging (this includes the nighs of your biggest wins and yor biggest losses) $200 per night, that's 20 BBs.... so, if you play for 4 hours, that's 5 BBs per hour, which is very, very good.
I tend to find that people who talk in these terms ("average night") don't really know how much they make though, or are looking at their results far too short term. Play 10k hands (minimum) and let me know how many BBs you are up or down. That's a better indicator of how you are doing than "an average night."
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