It depends on a lot of things, i was quoted a year by Sunderland 2 and half years ago and just had my op this week.
Because i have a heart condition i had to wait ages for an echocardiogramme, i had to wait for sleep studies which was held up because they forgot to refer me, Appointments often got cancelled and long waits for new appointments to come through. People used to tell me to keep phoning and asking what was happening but i didn't like to so i suppose some of it was my own fault.
I got there eventually though