WoW: The Expansion Life Cycle

Burning Crusade launched in January 2007, and from that point until November 2008, level 70 was the endgame of World of Warcraft. For roughly 23 months (with staggered content releases, with the Black Temple launching later, then Zul'Aman and then Sunwell/Magister's) players all leveled to 70, ran heroic instances and Karazhan to gear up, and then some of them began making their way through Gruul's Lair, Magtheridon's Lair, Serpentshrine Cavern and Tempest Keep before moving on to Mount Hyjal and the Black Temple.

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