Lucid dreaming doesn't really take mutch time. The big problem with school is that you can't sleep out, and this may hurt your dream recall a little bit. Just do it like this; Before you go to bed say a little mantra for 5 minutes, something like "I will remember my dreams", you can do the same with lucid dreaming if you want.

When you wake up the first thing you need to do is think about what you dreamed about. I know a lot of people will rage at me for saying this, but you don't need a dream journal to get a decent dream recall. It's a great method to get started, but these days i just use it to put in the dreams that have a special meaning, and my dream recall is still good.

For lucid dreaming just pick some days in the week where you will focus on it. You don't need to try it everyday, you will probably just burn yourself out.