What to make of firms with differing billable hour requirements?

Current 1L fortunate enough to be considering job offers from three firms with differing billable requirements. One states 1,800, another 2,000, and the third claims to have "no minimum." Both 1 and 2 allow pro bono, training, etc. to count towards the requirement. Will these differences have any meaningful impact on the associate experience?

Taken at face value, a \~10% difference in annual hours seems significant. I know, however, that people work hard at all of these firms, so I was a bit hesitant to ask about this in interviews for fear of coming across as someone who's looking to avoid that. Is this something I should give any weight to in choosing a firm? Thanks in advance for the advice.

Author: RutabagaOpen9027