I think the least I have worked over the last 5 years is 40 hours, and the most is 110 (but that was when overtime pay made it worthwhile!) but the benefits include so many holidays I end up selling three or four back each year.

In my firm there is not an expectation of high hours, in fact many folks work 37 - 45 quite happily, but if you do bring in results, you will progress faster. Same as most places I expect.