Hi MBoozer,
The SWAP function is not offered with Contour in contrast to our first generation DVRs. This means the functionality to swap between tuners is not operational. I regret the buffering will only suffice for one hour and that is only if you have been watching the channel. Should you happen to tune to a new channel, the ability to rewind is only available for the viewing time. For example, if five minutes have lapsed, you may rewind only five minutes. I know this is not what you were looking to hear, but I hope this helps in your decision. Let us know should you have any further concerns.