Access token expiration time

If the application does not have a web service that can automatically refresh the Access Token (implementing Server-Side flow) and therefore it can not avoid to lose the validity of the token at running time, you still can use a token that doesn’t expire requesting the neccessary SCOPE (for example if you are registering the Track of a vehicle and the driver could not stop to re-login in the app when the token expires).

Keep in mind that if you do this, you should take precautions to prevent the access token is captured by someone.

Read more about this in these guides: