I bet you have alot of friends to switch play when you sleep
Anyhow: sick sick shit.
678 -> 688 Takes about as long as 1 -> 33
678 -> 685 Takes about as long as 1 -> 100
Leveling to 678 takes about: 335.365.920.000xp
If this crazy dude (and friends) played most optimal xp runs, such as Cota and Crypted and what not, it might took only between 700 and 1100 hours to get to this level.