Sabre, look in the last issue of soldier magazine, the Army Air Corps had a page or so on how to become a pilot.
Age, rank, time to serve etc.
A rounded background tends to help, infantry to tanks, chefs to drop shorts, tthe Air Corps must have a least one of each.
At the moment I think the pilots course is taking about 18 months (could be longer) however the Grand Fromage wants to cut this down, it gets in the way of the officers career structure. It would also depend on what aircraft you convert to at the end of wings. extra 10 weeks for Gazelle course, 6 months plus for the AH64.