How long should I allow for underarm hair removal?

I do have a lot of body hair,

I usually only shave my arms and legs, and I shave my underarms occasionally, haha.

They say underarm hair removal is convenient, but I don't think it'll be a one-time thing.

I have thick hair, so I am wondering how many sessions would be needed and how long I should schedule the intervals.

And I'm also curious if it hurts a lot.