In LA, you can go during non rush hour on what should be a 5 minute skip across an “easy” onramp/offramp, and get stuck in 2 hour traffic jam (probably an accident but who knows could just be all 3 major sports having massive games at the exact same time and you’re not a sports fan so you didnt expect carmageddon) to go 3 miles, and make it the same way back in five minutes. There is no such linear relationship. It’s kind of like predicting the weather, depending on what part you live in.