I configured session timeout 3600 sek. with WPA2 and PEAP using Microsoft IAS as radius.
The rekeying is not mandatory with WPA2 because of the "good" encryption algorithm. But if I configure it I want to rekey. By the way microsoft defaults a session timeout of 8 hours so a rekey should occur.
When I remember 802.1x, so the authenticator (WLAN-Controller) should initiate the reauthentication. I don't see any rekeying on my radiusserver so I think the controller does not work well.