No I don't think it can, but what you could do is not upload your ride at the end of each day. Simply turn it off and then turn it on again for your next ride, the mileage will commence for where you left of. In essence, the Garmin will think you're still on the same (very long) ride. Beware though, it's possible to fill up the memory this way, sooner or later you're going to have to upload your data to a pc.
Dave.