Youtuber Sodapoppin has found a way to run a racket on the entire World of Warcraft model at this given moment to easily level up a brand new character from 1 - 100 in only 5 hours.
That's right. In one sitting you can hit the current level cap of 100. Through a shrewd combination of farming various experience potions and other experience buffs along with a stackable potion complete with the recruit a friend buff he works up to about 950% bonus experience!
Check out the video and note the various time stamps to see his progression and marvel at how long it took you to hit those various levels.