How many laser hair removal sessions are recommended?

I shave frequently, which has made my skin rough and irritated, so I am looking into laser hair removal. I’ve heard a lot of people say that there isn't much difference after just one or two sessions, so I’m curious about the actual recommended number of sessions. I’d also like to know if the treatment involves receiving sessions at fixed intervals for the first few and then increasing the intervals later. I’m also wondering if more sessions are necessary if my hair is thick or abundant. I think I would be satisfied if I could just reduce the frequency of shaving rather than getting rid of it completely. For those who have actually had it done, please share your experiences on at what session it took for aftercare to become easy! I am currently thinking about about 10 sessions.