How effective is laser hair removal?

I usually used to shave occasionally with a razor.

Lately, I've been really debating whether to get laser hair removal.

Those who have tried this said it was really effective, but the problem is that it costs quite a bit.

So, after getting laser hair removal, I want to know if the effects are semi-permanent and how consistently I need to get treatments to maintain a clean state.

How long does the effect last after just one treatment?

Also, how often do I need to receive it to be satisfied? I was worried about the cost.