Steve Foley writes:

I believe Microsoft logs the flights for you, so you can lose all your
flight time when you need to re-install.

It's an option in the sim. Some add-ons also provide some degree of
logging. The Hobbs meter in the Dreamflight aircraft accurately
measures time, and the only way to reset it is to reinstall or modify
some configuration files. Likewise, some of the instruments have
total use timers; I don't know how to reset some of them, short of
reinstalling.

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