GoPro Fusion extended recording?
This is very straightforward to set up, yes. Because you can fill up SD cards very quickly with the resolutions these are capable of, you could run one at 1080p for longer duration, but that's still not going to stretch to 6 hours.

For that length of game you will want to have it connected via USB to a PC of some kind recording the video feed directly to disk, and providing power.

Relatively simple - and in fact using the default software that comes with the GoPro Fusion, you can pretty much do that out of the box.

As the Fusion has voice commands, that can also make for a very unobtrusive recording station.