How busy you are is determined by how many cases you take on, and how complicated those cases are. You could have one case that takes a lot of research, and then another that's pretty cut and dry.
If you're like most of us, then money talks, and you may take on more cases if you'll get more money from them, which is fine, but it can bog you down.
Being successful in law means being at work 24/7. Maybe not at the office, but at home to. Having a life can done if your organized and know your priorities.