I find that I get roughly DOUBLE the 30 hours that my 622 says is available when I record MPEG4 channels. OTA (MPEG2) is pretty much spot-on to what the DVR says, and the MPEG2 HD channels, HBO (ch300), Showtime, HD Theatre, NDNet, etc use almost, but not quite, as much time as the DVR anticipates.
But I repeat, for the MPEG4 channels (which over 90% are), I'm getting about 60 hours of HD recording time on my supposedly 30 hour 622.
Enjoy you new TURBO-sized pixels as Dish adds more compression!
I just checked again. I now have only MPGE4 HD recordings on my DVR. These recordings total 13.75 hours, and my 622 says I have 24 hours and 4 minutes available. It appears that MPEG4 is taking up 44% of the space that MPEG2 do (at least for the particular recordings I have on my DVR).
Hours are only going to be so accurate with variable bit compression. I would like to see a measure of GBs remaining. Maybe flip between the two gauges for space left.I have to believe that once Dish is all MPEG4, they will send a software update to "fix" the counter on our DVRs.