My advice is be wary...I've seen many instances of part-time pay but full-time work, particularly at the Big Firms. At the end of the day, a client deliverable is client deliverable...a deadline is a deadline. Not quite acceptable to say, "I already put in my 10 or 20 hrs this week, so I can't work anymore." I've had supposedly part-time colleagues who were putting in 40 hrs a week anyway as expectations of work quality and rigor were just as high.