The wireless live streaming plug-in may overheat at 4K. Streaming at 2K seems to be fine. Also, I don’t know if there are limitations with YouTube itself.
Do you know if YouTube allows 8 hours streaming? If so, and the limitation is the camera, it’s not 100% certain that the Wireless Live streaming Plug-in can stream at 4K for 8 hours. I have not been able to test it for that long.
Greater chance of success with the USB cable and a laptop with the proper USB port power.