In an interview with GamerZines, Gearbox’s VP of marketing Steve Gibson revealed that a recent playtrough of Borderlands 2 was done by game guide makers and it took them 58 hours.

“What we like to think about it is, Borderlands is a hobby. Some guide guys just did a playthrough of Borderlands 2 and they reported back to us that it takes 58 hours to play through the campaign – and that’s just one playthrough with one character”

You can checkout the full interview where they talk more about Borderlands 2 at their website:
GamerZines

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Ryan Tyner
Ryan is an owner and manager of the oprainfall website, mostly managing changes needed for the website and maintenance. He also writes articles from time-to-time. His gaming interests include mostly RPGs; both Western and Japanese. Ryan has a graduate degree in psychology.
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