I have had it - over a 6 week period if I remember correctly . Thankfully these sort of details have faded with time.
Everything does seem to take huge amounts of time. The initial marking up and tattooing -which is when precise tiny dots are inked onto the skin in preparation for the treatment. These don't hurt and are usually hidden -even if they weren't they aren't noticeable to anyone else. And if you have a massive objection to them for any reason you don't have to have them - they can cope with indelible ink and replace as necessary .
The comes the planning of sessions. These are meant to be spaced out evenly but sometimes are not due to the machines breaking down - which even the newer ones are prone to do.
Each session will only last a few minutes and you're out but the waiting time can be anything -unless you are canny and ask for first or last sessions of the day and tailor your travel accordingly. Obviously this all depends on the hospital and may not be possible to ask for.
The treatment doesn't hurt at all and you become extremely blasé about walking in to a room and stripping your top off before lying on a table with your arm above your head (or is that only me?).
The burning comes later and greatly depends on many factors . Personally ,I got red quickly and then blistered and peeled revealing a large expanse of raw ,weeping skin.This was treated with special gel and very loose dressings. But I had a Bolus which is some material which is used to concentrate the beam at a certain depth (this was in my case because of irregular tissue depth) and had the effect of magnifying the burning on the skin. But it was really not a problem . Once dressed properly there was little pain and it healed quite quickly.
The after effects are few usually . I have a horrible square of broken veins in the area where the bolus covered . But as no-one has ever -nor will ever see this area it isn't a problem for me. And no doubt if it bothered me enough there are many treatments for this to be explored.
It is eminently doable. It isnt claustrophobic having the treatments .It is quick and painless in delivery and the onset of side effects are so gradual you can cope with them as they develop.
Good luck