Mendix default session timeout

I've found some forum posts about the timeout of a Mendix session, but I haven't found a conclusive answer to the following question: What is the default session timeout of a Mendix (3.x) application? If a user closes his browser without logging out, how long will the Mendix server keep his session (System.Session) open? Our customer is asking for this value and I can't find it in any documentation.
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