I'm serving ArcGIS Desktop concurrent licenses from ArcGIS Administrator 10.3.1. The maximum borrow limit is set to the default 30 days. It seems to me that I once extended that time for one of our installations. A notice in Administrator says to "Contact your License Administrator to modify this value." Administrator Help unhelpfully says "Contact your organization's license administrator to change this value." I tried contacting our license administrator, but that didn't help, because he/she is I. I searched Support, but only found explanations that the maximum time is 65536 days, and warnings that it is best to keep burrowing
