The files sent from a master to his slaves have a 48 hours validity to avoid manufacturer update being released before writing.

Here is an article that explains the risks of writing an obsolete file :
http://help.autotuner-tool.com/en/articles/4027883-why-should-you-always-read-the-ecu-before-writing-the-tuned-file

You can modify this timeframe for each slave individually by opening a support ticket request and asking so. By experience, we strongly recommend not to modify it in order to avoid any bad surprise.

Note that master files do not expire.

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