I'm not very experienced and I'm certainly not trying as hard as I could be, but I get spontaneous LDs at least once or twice a month. Most are douring the weekend, when I sleep for like 11 hours. I guess if I fixed my sleeping habbits I would get them douring the week aswell and the number would most likely increase... I can't really expect much without sleeping which is something a real dreamer should do.

I'd guess the pros get more than one per week. It's all about your dedication and willpower. I could easily increase my number, but as my lazyness and sleepyness prevent me from doing so.
By the way, good luck with LDing.