I've worked at many remote companies by now. None have asked how many hours they're getting out of me. And they all got more or less the amount of time mentioned. And they were all plenty happy with my output!

Why would they care if the output was the result of fewer hours? If they wanted to pay me by the hour, they could have negotiated that.

At-will salaried employment cuts both ways :) and in this case, everyone is happy. Anyone wanting more hours out of me is just trying to exploit my labor. I'm already getting paid fair value for what I'm producing.