The latest snapshot from master (for Play 2.1) has a new property that makes the authenticator cookie persistent if you need that. In your config file you can add:
securesocial.cookie.makeTransient=false
securesocial.cookie.absoluteTimeoutInMinutes=1440
securesocial.cookie.idleTimeoutInMinutes=1440
That would make the cookie persistent and make the session last 24hs.