GM developed its Hummer EV in 20 months. It wants that speed to be routine.

GM designed its electric Hummer in 20 months, a process the company called "heroic." Its chief product officer told Business Insider it wants to make that more common. Josh Lefkowitz/Getty Images General Motors tells Business Insider it's trying to cut the time to develop a new model to two years. Automakers are trying to make cars faster amid tariffs, EV stumbles, and competition from China. GM shared some tools it's using to virtually test cars before building prototypes. General Motors w...