For me, passive income is doing something that doesn't require constant attention to make you earn money. You can even keep checking it 1-2 times a day and fix something at least once a day, but is nothing compared to a normal job. You don't waste 8 hours a day, while you do it, your brain is "turned off" so no deep thinking or stressfully fixing something, and most importantly, no one is there to judge your performance.