I recall that when I did IOT (mid '70s) it was a 16 week course at Henlow for Direct Entry cadets but for university cadetship graduates it was 14 weeks at Cranwell although we did also do a 2 week course there prior to starting at UAS so still had 16 weeks training in total. So how did we fare? One of my entry became CAS and I have (except for a couple of years with an airline) flown military aircraft continuously ever since. 14/16 weeks seems to have worked!