:lol get the fuck outta here with that bullshit.
While he is almost certainly wrong that the full install was done in that time, I've never had a disc based game take more than 60 seconds to be playable from the time the disc went into the system. Whether or not the install is complete at that point is totally moot.
As far as downloads go the system seems to severely throttle the download speed if the system is on (presumably to not degrade the experience if you are playing a game online or streaming video), but I normally put my system in standby after initiating a download. I can't recall any times a game has taken more than 30 minutes to be playable or more than 2 hours to be fully installed using this method.