Getting all the way to the highest levels in World of Warcraft is usually a quite pleasant albeit slow going. There is much lore to share and many places to explore and investigate. Someone has managed to reach 100 in one single day and have of course uploaded a video guide showing exactly how to do this.
The guide offers a strategy to cope with the final ten levels in just five to eight hours. In other words, you would be able to cope with the whole tier system of Warlords of Draenor in one single day.