One analyst said the most dangerous time for AI is 2029, when the cycle is likely to reverse, leading to a bear market and a sharp decline. I think it's more likely to be 2028, or for some companies, the second half of 2027. It depends on the industry and the company; they don't all follow the same trend. The most stable are ecosystem platform companies: Google, Microsoft, Amazon, SPCX, and Nvidia. Even if you buy at the top, these will likely reach new highs later. Other currently popular hardware stocks are the most dangerous cyclical companies. You need to get out before the cycle reverses, otherwise you'll end up with nothing.