LoRaWAN session termination

I want to konw about the Lora WAN session keys. As there are two session keys generates upon joinig(OTAA) AppSKey and NwkSKey. When this two keys will expires ? or it expires or not ? what is exact meaning of session in LoRaWAN ? If the keys are expires then how and what is the session termination timeout? Please help me out.
Thanks in advanced…

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At the LoRa Server side, please check the device-session TTL configuration value. To learn more about these session-keys, please refer to the LoRaWAN specification.

Hello brocaar,
Your reply is helpful.
Thank you so much.