One of the coolest tools that Autodesk offers that is 'free' is Screencast. In this video demo, I have created the 'basic' options file and I am testing it with Revit 2015.
The settings for the 3 line items in the Config Services Tab for the Autodesk Network license Manager is:
C:\Program Files\Autodesk Network License Manager\lmgrd.exe
C:\Program Files\Autodesk Network License Manager\BDSU-2015.lic
C:\Program Files\Autodesk Network License Manager\BDSU-2015.log
The Options file is called: adskflex.opt and has the following in it:
MAX_BORROW_HOURS 86238BDSPRM_2015_0F 144
IMPORTANT: If you change a parameter in the options file, you need to Stop & Start the server via the Stop/Start/Reread tab.
Here are some reference posts: