How long does laser hair removal last?

As the weather gets colder these days, I'm starting to take better care of my skin, and I'm thinking about getting laser hair removal.
Shaving and waxing are becoming more and more burdensome because they are cumbersome and irritating.
So I'm looking into laser hair removal treatments at hospitals, but there are so many different types and prices that I'm confused.

After researching, I found out that there are several methods, including alexandrite, diode, and IPL, and that the effectiveness of laser hair removal varies depending on skin tone and hair thickness.
Many people say that it is important to receive it consistently because it takes a few times to see noticeable results.
They say that redness or folliculitis may occur after the procedure, but it will be fine if you take good care of it.

I'd like to focus on my legs and armpits, but I'm curious about how painful it is.
I'm excited because there are many reviews saying that my skin becomes smoother after laser hair removal, but I'd also like to know how long it lasts and how often I need to have a second treatment.

Has anyone ever had laser hair removal treatment at a hospital?
It would be really helpful if you could share things like the treatment effects, satisfaction, and management tips.