[Haste] Haste and the Global Cooldown

Would it be possible to build up 50% haste to(for example) make a 1.5 sec cast spell a 1 sec cast?

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I thought haste also reduced the GCD?

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However, it does not lower the GCD of any melee or ranged ability.

Wrong term, CD.

How much haste would it take to reduce the GCD to 1s?

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