I'm an offshore lawyer out in HK.
Hours are generally get in by 9.15 and work until around 19.00 / 19.30 with around 1hr - 1.30hr lunch.
However I have been known to work weekends, a public holiday or two and a few late nights in the past five months that I have been here. However I think my hours are MUCH better than the main "onshore" firms and without a doubt better than the US firms.