Some punk kids worked on this safe for 6 hours and never got it open. That is not to say they were skilled (or sober/straight) but it's the story I got from the dealer.
From experience, I find that hard to believe. That's no more than 15 minutes worth of lazy work.
Keep in mind that a safe rated for 15 minutes of burglary, made out of the same steel as that gun safe, is going to have 1" solid walls, and a 1.5" solid door. Since your average gun safe is 12 gauge, that means the walls are 10 times thicker, and the door 15 times thicker.