Running your gaming rig for three hours a day at 500W (1500 Wh) would therefore be the equivalent of driving 8km (5 miles) in a modern electric car. Still ok comparatively.
Very few people have computers capable of cooling a constant 500W.
While this is true, I don't agree with your statement about cooling.
It's very possible to have sustained 500W+ draw while playing a modern game on a 3080/3090. Sometimes you might play games for a few hours with a fairly consistent 500/600W power draw - honestly I think it's cheap and easy to cool this kind of load. A few 140mm fans and a mid-level CPU cooler should be enough.
Yeah... Nearly nobody has a few 140mm fans on their computers. Most people won't have any fan lager than 120mm. Powerful computers usually have a pair of them. Maybe 3 if you count the PSU.
Plenty of people going on ski trips in Europe will run their car at 130kph for hours.
My commute to and from the office alone would be about 90 minutes at that speed.
Have you been to the US? I regularly drive 4+ hours at 125kmh+ anytime I'm trying to get to the Sierra, or Utah or Arizona, which is often.
In fact, almost every weekend I drive at least 3 hours round trip, half freeway half mountain roads, if I go to the closest good climbing. 5+ if I go to my preferred locale. The distances people regularly cover are enormous.