If you mean recovery heart rate, stop your activity and wait 2 minutes without saving it. Your recovery heartrate will pop up on your watch. If you mean the number of recovery hours, I don't think the 4S has that. My VA3 doesn't.
as ovekvam mentioned Runalyze.com or Tredict will give you access to that data, and hopefully with introduction of System 5 our watch would be able to access this metric too.
