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According to survey, The reason it is seeming to take longer is the fact that you are in the entry zone to Northrend, and there are a gazillion people there doing the same quests(World of Warcraft gold) as you. This can increase the time quests take, and make it seem like the 20,000 EXP you get per quest is not enough for the time you spend.
However, if you say on average, you need 1,500,000 EXP to ding, that is only 75 quests at 20,000 EXP each. Think if everyone was not there when you are trying to do those quests- you would be leveling a lot faster without having to wait on respawns for things. If you really do have more than one character(wow gold) to level to 80, then your first character will be the hardest to do so with. By the time your first toon is 80, the flood of people in the starting areas will probably go down, and you won't be waiting forever for quests to get done. That will greatly decrease the time you will spend getting them to 80. Just relax and enjoy the content Blizzard worked so hard on. A group of people from Alleria have cleared the content Blizzard worked on for two years in a matter of two days; what can they say they really enjoyed from the expansion pack. The glory of being the first person on their realm to hit 80.