I am not subtracting flight hours, just making them add up. The rules are that the hotspot hours + medium hours + quiet hours = total hours. I also did 'training' before joining a squadron in France but those hours were not counted towards my DID total at the time.

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RAF 1966-73 Cpl Engine Fitter (Retd.) Trenchard brat 206th Entry
DBA and systems programmer 1981-2005. Now retired since 2014