To my mind, long working hours aren't stressful on its own, it's not really stressful if I earn a decent salary but it become stressful when I earn a few bucks and after work I have to think how to keep myself alive tomorrow. Long working hours are also stressful when salary is normal. Overall, when salary is high, it motivates you to work even longer, that's my experience and mental state.
Due to social medias, people no longer able to claim themselves earn high.
Even you higher than your co-workers and average people who're in the same profession, but after see a random kid posting how he can earn 100x than your income, it reduce your happiness.
You might not thinking he has an easy life, but if he spend the same amount time to work with you but he earn multiply, it's no longer make sense.