I had a billable hour requirement of 2200hrs. We were given a total of 7wks paid time off, including holidays, so, assume you took it all (nobody did....that was a sure way to get a horrible review), that's 45wks in a year. So, an average of about 49hrs/wk.
It doesn't sound like much, but it's BILLABLE hours, so if you take bathroom breaks, breaks to run out for food, breaks to get a drink, breaks to sit in your car and scream (OK, maybe that was just me) you're actually working 10-12hrs a day and many weekends. Anything you did that you couldn't bill for (that 10mn conversation in the hall with your office neighbor), didn't count.
2200 was the minimum and it was frowned upon to only do the minimum. That's Big Law in Downtown Boston. It was rough.