Assuming that somewhere on the DVR recordings screen, it has an estimate of the recording time remaining, does that estimate, unlike the ViP receivers, take into account that MPEG4 takes up less space than MPEG2?
The estimate is a percentage of space available on the internal hard drive. It is not quantified in hours (at least that I've seen). Seems to be identical with the 922 in that regard (and many others for that matter...in a GOOD way though!)