The confusion is because many of us work many days remote, and/or have flexible hours. For many of us, our entire existence is oriented around improving a bottom line...so when we have down time, we are recreationally reading about how to do that better, whether we are on the clock or not. So, if you are a remote worker, and you produce 3 proof of concepts for your company for fun, and none of them pan out, how many hours did you work? Nobody knows, including you.