Long hours aren't necessary for success, and you should do what works for you, but they’re needed if you're aiming for the top in your field.

It's an inconvenient truth, but you're not going to be able to reach the John Carmacks of the world if you're working 40 and they're working 60: https://twitter.com/id_aa_carmack/status/1210593150303031296

Anyone who thinks he would've achieved the same with far fewer hours are just kidding themselves and pulling crabs down into the bucket. Also implicit in that is Carmack being a fool for working 60, when he would've been as or more(!) effective with less? Nonsense.