As per milestone , login token expiration is 1 hour . I need to extend it continuosly and avoid expiration .Kindly suggest to achieve on the application . I have an application which after login token expires after an hour.

[Bo_Ellegard_Andersen (Bo Ellegård Andersen (Milestone Systems))]

If you are developing a plugin there is no expiration because the environment take care of token etc.

The OAuth token does expire after one hour, so I am guessing this is what you are asking for. This cannot be changed. You can implement a solution that renews the token.