In SPE2410, we have deprecated the serviceName parameter from the URL. However, you can still use the existing URL. By default, the service name is the one you have logged in.
If you do not log out, the user token expires after the period of inactivity that the timeout value defines. The default timeout value is 15 minutes. For more information, see Managing-Common-REST-API-session-tokens-and-user-tokens.