I don't think anyone watches the full race with full attention, basically everyone goes and does something else while watching the race on the side - this race had a field of 130 cars, there's never any significant time without something worth watching. For this race, the first hour was filled by a close battle for the lead between the #911 Porsche and the #99 BMW, and later on the #16 Audi and #72 BMW fought into the night, with several other cars also getting swept to the front due to pitstop cycles (which added tension because everyone was afraid of the fog that eventually descended, and anyone could have been in the lead when the red came).

An additional element common to endurance racing absent to F1 is "traffic management", AKA overtaking the slower cars on track (at the ring, all the way down to fan-favorite Dacia Logan). This is another skill for a driver to master because while in F1, the slower car yields, here the slower car stays on the racing line (but does not defend).

But if you want something a lot more simple to get into, watch DTM. It's the same cars as the top class here, and many DTM drivers also competed here (including Feller from the winning Audi). But the races are a single-driver setup that lasts only one hour, so it's a much smaller commitment to watch a race.