How long does each 'tour of duty' last?

How long does each 'tour of duty' last?

You can get to choose. You have something called a general application known as a gen app in RAF terminology. Your gen app for the particular tour you would like to go and serve next. The Royal Air Force is very keen to keep personnel interested, keep you happy. So basically people go where they want to go because it is going to keep people in the job. So yes you can choose where you want to go. But if there is a manpower requirement for you to go elsewhere, you might have to go somewhere else for a certain length of time as well.