Gonna do a quick calculation here:
The counter on the video was at approximately 38,700 seconds at the last time it was shown. Add another 20 or so to get a better estimate of how long *it* was being watched.
Divide by 60, then by 60 again. It'll give you roughly 10 and three-fourths hours of Nyan Cat before the... "technicolor yawn."
...That sounds about right.
Animation was spot-on as always, the audio was fantastic, and you gain bonus points for making it fit the current holiday theme. ;D
Yeah, I can't think of anything in this flash to which I can criticize. 10/10