It's 40 minutes per attempt if you're really fast. It's usually 55 minutes if you're average per attempt. That's just the Skolas fight itself and it's the longest boss fight out of any boss fight I've ever had. To give you an example of how long it takes, Arthas was a 14 minute fight in Heroic Mode in 25M in WOTLK for WoW. That thing took skill to do, Skolas doesn't take skill--it just takes a buttload of free time.