Elon Musk took the stand in the OpenAI trial and faced nearly three hours of cross-examination from OpenAI's attorney. Bloomberg/Getty Images Elon Musk took the stand and faced nearly three hours of cross-examination from OpenAI's attorney. Musk's interactions with Shivon Zilis were scrutinized during the court proceedings. Exhibits show that Musk once saw himself as a potential OpenAI CEO. Elon Musk was grilled for nearly three hours by OpenAI's lawyer on his second day of testimony in a high-stakes civil trial — and he will face more cross-examination on Thursday. Here are the biggest takeaways from his time on the stand on Wednesday as he was questioned about how much control he wanted over OpenAI; his lawsuit against the company and cofounders Sam Altman and Greg Brockman; and communications with his now-partner Shivon Zilis . Musk explained why he waited years to sue One of the biggest questions about Musk's 2024 lawsuit is why he waited so long to sue after leaving OpenAI in 2018.…