How many sessions is usually recommended for laser hair removal?

It is a hassle to remove my underarm hair at home every time, so I plan to take this opportunity to get laser hair removal done properly.

It looks like there is slight discoloration. I'm wondering if the procedure can still be performed in this condition!

Could you please explain the recommended total number of sessions and how I should schedule my visits to achieve clean, permanent hair removal results?

I am also curious about what type of laser hair removal equipment it is.

I would like to know if the procedure can be performed safely and without irritation, even on underarm skin with deep hair roots or sensitivity.

I would appreciate it if you could let me know how long underarm laser hair removal usually takes, and whether I should avoid exercising or sweating activities on the day of the procedure!