I fit the timescale of that advert although I thought I wrote to Wg Cdr M A D'Arcy not the Gp Capt. 6 months and 20 days from joining to first solo and that was in the terrible winter of 1962/3. More importantly 25 months from joining to being posted to my first Vulcan squadron.
This was at a time when the system worked because the RAF needed the aircrew. Holding postings were virtually unheard of!
ACW