Hi and welcome! If you are dedicated, I'd say you'll have your first one within a few days. But it's like Zebrah says, it varies from person to person. Your DJ is something you need to write in every day if you can, the more you recall from your dreams, the better your recall will get. In time you'll remember loads of them each night.

If you want to try really hard, I suggest you think about lucid dreaming all day long. Daydream about what you WILL do. Know you will have one within a few days, and realitycheck a few times each hour. Just before bed, you either meditate or clear your mind in any other way. Then you tell yourself you WILL have a lucid dream. Repeat a small line, like; "I am dreaming" or "I lucid dream" over and over for as long as you can. That is called a "mantra". Don't let it keep you up, but try to have the last thought before you go to sleep about lucid dreaming.

If you can fall asleep quickly, I suggest you try to sleep for as long as you can. Everytime you wake up during that time, you tell yourself "When I fall asleep I will lucid dream" and do the mantra.

Good luck!