Mine took about 4 weeks after I got the form right, but BE CAREFUL filling out the form, its like USA customs, any tiny mistake and you are right to the back of the queue again :-(
Worked great for me, if I work hard, I get all the rewards, be lazy and I have to do without, it soon focus's the mind.
Psycologically, feels nicer too, no boss!
My sister is a GP and brother in law also in the proffession and they mentioned the other day that it IS an op which carries quite a risk, having said that, so does being drastically over weight, so its a tricky one to balance. Take advise from your doc and possibly try everything else first ?