I finished the initial Dark Portal quests on my Human Mage, and now after escaping to Shadowmoon Valley I found this nest with about 5 level 90 Lunarfall Chicks with 4k hp each, they respawn almost instantly.
Thursday
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720k exp per hour (instant respawn 4k hp mobs), can be automated (risky though)

I finished the initial Dark Portal quests on my Human Mage, and now after escaping to Shadowmoon Valley I found this nest with about 5 level 90 Lunarfall Chicks with 4k hp each, they respawn almost instantly.