I'm gonna say something unpopular: I don't like to rush.

[Vahlnir]

Then you are the unluckiest person in this game. And in that case I pity you. I may not have the play time you do, as I came in around 3.5, but not once have I seen a dungeon take more than 30 minutes. Not back when I'm a DPS, not when I'm a healer, and especially not when I'm the tank. So either you are exaggerating, or I'm the luckiest person in this thread.

I find it somewhat questionable that, since you have been around that long, you haven't seen a 30 minute dungeon at least once. They aren't common, but they do happen.