[qasdfdsaq]

The bitrate of youtube 3D at 1080p (like I said) is 10mbps. Therefore you will stream in realtime without waiting for it to buffer at... surprise surprise... 10mbps. I never said anything about downloading or buffering or connection speed. The video stream itself is 10mbps.

Given the bitrate of quad-1080p is 20mbps, half of that, i.e. dual-1080p can easily fit into 10mbps.

I'm not sure where you get your math skills from, but 4.5GB of data would not take several hours to download, it'd take 1 hour, one minute, and 26 seconds at exactly 10mbps, or far shorter than your average movie. I don't know where you pulled 4.5GB from either, but a 90-minute movie at 10mbps is ~6.6GB.