15-20mins. Less for the first two, but it took a while to prepare for Opeth with a bigger stage. Actually, it was probably just because I was so excited. Oh, and I thought DevilDriver's guitar tone was awful, almost inaudible. There were some really tounge-in-cheek moments from all 3 supports, even though I have cynical opinions, but I couldn't help but laugh.
Does anyone have the full 3IOB setlist? I only caught Deadly Sinners and Goatrider's Horde. As for the others, DevilDriver were fantastic, and Arch Enemy were definitely my favourite band of the night. I didn't think too much of Opeth though. If anyone saw a small kid, in a pale blue t-shirt (not very metal, I know :P), that was me. :)