The YouTube description of this 'I Gotta Feeling' lipdub says that the video took just over two hours to film. Judging from the 2.3 million plays the video has gotten (and counting), I'd say it was time well spent.
Implications - The 'I Gotta Feeling' has been a massive YoutTube success, racking up over 2.3 million hits. The 172 communications students at UQAM created a a phenomenal project that will certainly outlast their time at the University. This is simply a fantastic project that I hope to see more of.