People work hard in the City. MC or not, you will have to work long hours from time to time. That's how it is. The people who cope best are the ones who genuinely enjoy the work and don't see it as seriously damaging to their happiness to be in the office late now and then, or sometimes, very late for a series of days or weeks. If going home at 5.30pm and having your weekends totally free is very important to you, and you don't want to get messages on your Blackberry or your mobile while you are on holiday, don't work for any City firm at all, because it makes demands on your time.
It has its rewards, if you're the kind of person who gets a kick out of the work, enjoys the high profile of many of the things you'll be working on etc - and there is also the financial compensation. This is pretty good, as has been said being £50,000 or £60,000 on qualification (and in some firms, a few grand more than this). It is a very decent salary for a person of 24 or 25 as many NQs are.
However if you're in law to get rich, you are in the wrong business. No lawyer will be able to retire in their early 30s the way some bankers can. You may save up enough to "downsize" your life then, if that is what you want. Law provides a decent, stable, considerably-above-average salary for the long term.
It is not, though, as I say, a way to get rich quick!
I am 1 year qualified and have been in the office for 30 hours at a time before now, but it certainly is not the norm, and you'd have to be mad if you would work that hard on a consistent basis for the salary that you get in all honesty.