For details on the nitty-gritty of the engine problems you`ll be best watching this:
With regards to the actual data on permitted times of use see below, although I suspect
that these times were varied depending on the state of the engines at the time. You`ll
find various things written which conflict, hence probably the confusion resulting in your
original question.
These reports below were by the British, but the data is just translations of whatever the
engine data card found in the aircraft said. So should be regarded as accurate.
For earlier E-7 versions with 601N (Royal Aircraft Establishment - 9th July 1941 date of crash)
View attachment 593221
For earlier F versions with 601N (Royal Aircraft Establishment - Oct 1941 trials)
View attachment 593219
This appears to have changed slightly with the 601E of F-4 (Royal Aircraft Establishment - Nov 1943 trials)
View attachment 593220