new to both taxes and poker

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And Can a "session" be a whole day? Or is a session every time you get up and sit back down? (i.e., if
you sit down at the tables and play for a couple hours, then break for lunch, and go back, does this count as a new session?

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I'd like to see an official answer to this question too. I'd assume the more detail the better, but just curious if there is a "right" answer.