How much is expected of someone to get a 2:1 in Law ?

In terms of hours per day or week ?
Is there time for a decent social life ?

I have no problem with the prospect of working hard, I just don't like the thought of feeling I'm spending every waking minute slaving away to get this degree.

Do you have to have a certain natural ability to do well in Law, or do you just need a good work ethic and reasonably good memory ?

Thanks.