If I do 20-25 hours a week, and nobody else can outperform me in productive output, I don't really care how much hours they put in. I've had jobs where I was p

If I do 20-25 hours a week, and nobody else can outperform me in productive output, I don't really care how much hours they put in. I've had jobs where I was productive maybe 4 hours a week, and got excellent reviews. So I always wondered if I got that, WTF were the other devs doing?