I call a full clearing when all the hairs on my face have been treated. And no, it's not in one session. On the first clearing, she did my cheeks in one session, my neck in another session, chin in another session, and then finished the 1st clearing on my upper and lower lip areas. This last time, which was my 3rd full clearing, she did 2 hours on my upper and lower lips and then 2 more hours the next day on my cheeks, chin, and neck. I'm still a little sore.
She doesn't recommend laser on facial hairs except maybe under the best of conditions (very light skin and dark hair). She says the laser will damage the facial hair follicle, but not kill it. It may take awhile for it to come back, but when it does, it is even harder to kill even with electrolysis. She even scolded me (in a nice way) about plucking, which I did for about a year. She said that distorts the hair and it is harder to hit the follicle with the electrolysis probe.
I never thought I would be this interested in electrolysis. How things change over the course of one's life.