This is my first time getting laser hair removal on my legs. How many sessions is recommended?

Now that the weather is getting warmer and I'll be wearing shorts more often, shaving my legs with a razor every time is becoming too much of a hassle, and my skin feels like it's getting rough, so I'm looking into laser leg hair removal.

When I shave, the hair grows back quickly, making my face look stubble, and it seems like it causes more keratosis pilaris, so it's stressful.

I've heard that the effectiveness varies depending on each person's hair volume and texture, so I'm curious about the average recommended number of sessions given by clinics to achieve smooth legs. My leg hair isn't extremely thick, but since this is my first time getting this treatment, I'd like to know the minimum recommended number of sessions to see proper results.

After getting laser leg hair removal, how many sessions does it take for the hair to noticeably stop growing?

Also, I'm thinking of visiting dermatology clinics mainly near Gangnam Station so that I can stop by after work or on weekends. How much do they cost?
I am also wondering if the pain is bearable.