Hi, I would recommend trying to wait 15 minutes, even if the screen remains black. Additionally, I would ask you to try connecting an external monitor to the laptop to see if it shows any signs of life. In any case, I recommend you contact Framework support.
There’s no need to leave it powered on for hours, that was only a quick test to see if it was simply going through memory training. At this point, I’d personally recommend waiting for direct guidance from Framework support or from other community users. I’m sorry I couldn’t be of more help, and best of luck!