Apparently, negative experience affects us roughly 5x more than positive experience. So if the burnout is caused by accumulation of negative experiences, then I

Apparently, negative experience affects us roughly 5x more than positive experience. So if the burnout is caused by accumulation of negative experiences, then I gather, you would have to take 5x as much non-stress days than stress days. But whether the day is stress or not depends on your emotions, not on what the day is objectively. You can have a no-stress day which is really busy or even under pressure. I had some of the most productive days at work when I was solving a critical customer issue, simply because of the excitement (you can't do that everyday, though).