Even as a passionate twenties-something engineer I would see my productivity and output fall off a cliff after 6-7 hours of work even if I had a lunch or tea/co

Even as a passionate twenties-something engineer I would see my productivity and output fall off a cliff after 6-7 hours of work even if I had a lunch or tea/coffee break in the middle. I was fortunate to work for a lot of very cool bosses who essentially forced me out of office and occasionally gently teased me for working at night at home. I didn't realise how critical this was until I worked very briefly for another shop in the middle for a few weeks that demanded you finish everything within the same day to fit their scrum metrics. I could feel every ounce of energy sapped away after 6PM (after starting the day at 9AM) and had zero motivation to get anything done even though they demanded I stay. I was getting nothing done until they let us leave at post-10PM and I had basically spent hours staring at my screen. Left there as soon as I could