xAI asked data center providers how long it would take to get 100,000 GPUs running as one cluster. The answer was 18 to 24 months. At the Grok 3 launch Elon Musk said: "18 to 24 months, that means losing as a certainty. So the only option was to do it ourselves." So they found an empty Electrolux factory in Memphis and brought in "trailer after trailer of generators." They leased about a quarter of the mobile cooling capacity in the U.S. and used Tesla Megapacks to smooth out the power. Colossus was built in 122 days. 92 days later it had doubled to 200,000 GPUs. Both happened before the earliest date they had been quoted. Today Colossus 2 alone has 550,000 GB200 and GB300 GPUs, according to Elon Musk's own post (Sept 25, 2026). When the quote says two years, you can wait, or you can break the wall and build it yourself.