Most BIGLAW firms paying $120K+ a year raised their minimum billables requirements to 2200 hours/year. That probably works out to 75-80 hours a week (factoring in that one can't bill for every hour at the office).
My first year out we were encouraged to exceed 2140/year. There was really no minimum but we were reminded quite often that this number would be a major factor in our continued employment (firms have a habit of over-hiring first year associates and paring the number down over the following five or so years to a sizeable class for the partnership consideration.)
The partner I worked under had a bad habit of striking my billables to keep clients happy. It is a wonder I lasted in that life as long as I did. Of course I went right back into politics so that isn't saying much
And to clear a few other things up...
1. In my experience just attending a top-25 school is absolutely no guarantee of finding a sweet gig - firms are a lot more likely to take a Coif from a top-50 then a bottom feeder from a top-10.
2. Very few people graduate from law school before 25. For the most part the class will be split between those heading directly from college and those who have taken a year or more off to work. I have noticed though for the very top schools there are a lot more folks coming directly from college or from other advanced degree programs.
3. Salaries upwards of $150k for first year associates are the very top-end, but $110k+ salaries are becoming more and more common.
Here is a good article that examines salaries for first year associates.
I probably work as hard as I would have had I stayed. And although I definitely make less than I could have been making, I am having much more fun
