This is an emotional topic, the discussion of which is nearly always evidence-free. How could one study it objectively?
I tested it back when I ran a dev team. We were faced by constant pressure to develop customer stuff faster, and the team were doing regular 60+ hour weeks. I put in some new rules on hours, including: - no dev worked more than 40 hours on scheduled projects. Overtime was for disaster recovery or slippage repair to meet a deadline - if the salesperson agreed to a new deadline, then we went over their other tasks and…
I found that a week of working long hours was about my max, and after that I started making mistakes to the point that the extra hours actually became counter productive.