Account 1: Mage @ 120 days played, Priest @ 105 days played, Warrior @ 35 days played, Rogue @ 25 days played
Account 2: Priest @ 45 days played, Warrior @ 8 days played
Account 3: Priest @ 28 days played(current main), Rogue @ 9 days played, Shaman @ 23 days played
Anything above 25 is estimated except for my current main. In Vanilla and early TBC I spent about 12 hours a day ingame. Luckily for me, I am not as addicted anymore.