ICM, re-role changes and types, not as far as I could see as those selected for the V-Force were passed from Air Sec to Bomber Command for 5 years or 2 tours minimum.
I managed three roles but PMA drew the line at a 4th
I think the true GD fast track actually had few tours with air officers often having barely 2000 hours. I dont know what Craig had but as OC 35 he aimed at a 1000 hours and failed by just 10. According to Wiki he went from Hunters to Vulcans with a tour on SAM which would not have done a lot for his flying hours. He would appear to have done a limit sqn cdr tour having started as a flt cdr 18 months as OC. After Vulcans, from which I can guess he would have only had around 2000 hours became OC Akrotiri where he certainly flew with all Vulcan crews and no doubt the C130 and WW but I would hazard less than 3000 total hours.
This was in line with USAF General officers with often less than 2,200 hours.