IBM:

Virtually all console gaming systems of the previous generation used microprocessors developed by IBM. The Xbox 360 contains a PowerPC tri-core processor, which was designed and produced by IBM in less than 24 months. Sony's PlayStation 3 features the Cell BE microprocessor designed jointly by IBM, Toshiba, and Sony. IBM also provided the microprocessor that serves as the heart of Nintendo's new Wii U system, which debuted in 2012. The new Power Architecture-based microprocessor includes IBM's latest technology in an energy-saving silicon package. Nintendo's seventh-generation console, Wii, features an IBM chip codenamed Broadway. The older Nintendo GameCube utilizes the Gekko processor, also designed by IBM.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". How long did it take for Nintendo to develop the PowerPC tri-core processor?
unanswerable