Is it possible to change this expiration time for an access token for an API call or the UI?
There is no way for the customer to increase the access token expiration time directly. The customer can refresh a token using the refresh token API call. You can have a specific customized expiration time if you are using a client credential (It is recommended to use it in a system-to-system integration wherein human users are not involved like daemon tasks). However, it can only be changed if a Support ticket is raised. We do not increase the access token expiration time above the default expiration because of security "best practices".