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Current Seasons

Season 3 is currently active. It started on November 27 on the American realms and November 28 on the European realms. Although Blizzard has not yet announced the start of Season 4, a 20- to 23-week run puts the end of Season 3 between April 22th and May 13th, 2008. Looking at the progression, they might probably also add three more weeks resulting in a 26 weeks Season, which puts the end around June 3rd 2008.

Ended Seasons

Season 1 started on January 30th 2007 and ended on June 19th, coinciding with Patch 2.1.2. It ran for 20 weeks.

Season 2 started on June 20th and ended on November 26 on US realms, November 27 on EU realms, two weeks after the release of Patch 2.3. It ran for 23 weeks.

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EDIT - Ayrıca bir başka arkadaşın tahmini :

Season 1: 1-30-07
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Season 2: 6-19-07
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Season 3: 11-27-07
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Season 4: 5-20-08 (tahmini)