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