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OK so here we have the engine life of a Merlin III at 12lb boost and in 1938 it was 10 hours and later engines it was 20 hours at 12lb boost.
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Geez....
Nowhere except in your mind can you run a Merlin at 12lb for 10 hours.
That is the total time the engine ran during endurance trials of 5 minute intervals with a 20 minute rest period between each interval.
It could be used for 5 minutes at a time. That use had to be logged and the engine inspected for serviceability, and the reduction in life assessed before it could flown again.