The first TPU (Seastar) was designed, tested, and deployed in 15 months: https://arxiv.org/pdf/1704.04760 https://arxiv.org/pdf/1704.04760 They started becomin

The first TPU (Seastar) was designed, tested, and deployed in 15 months: https://arxiv.org/pdf/1704.04760 https://arxiv.org/pdf/1704.04760 They started becoming available internally in mid 2015.