actually I remember that they had even less than 10, that being only 5 minutes of full power combat time above London.
it was the main reason Luftwaffe haven't completely obliterated britain fighters during BoB because someone decided to start it before having the fuel tank ready for the 109s (and the fact that all pilots bailing out were recovered and flying again the next day for britons, while was lost as PoW for germans).
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