"Calling a Mendix web service does not lead to a time out anymore since version 2.4.5. The session does not expire until the call has been finished. Perhaps you are using an older version?" -
Arjen Hoekstra
This response was from an earlier thread... https://forum.mendix.com/questions/728/how-can-i-extent-the-timeout-settings-for-webservices I'm not sure if this also applies to consumed web services. Perhaps the timeout is defined by the third-party application