Six months and twenty days for me, and that included the better part of two month's holding. The education requirements are correct, and it was only two of the subjects at "A" level to qualify for Cranwell. By the time I turned twenty-one I'd done the JP course, a helicopter course, been on a squadron for a few weeks (they cut establishment, and the newbies were the cut), held on another squadron, type conversion and seven months overseas service with yet another squadron.