Someone I know all they do is draw/paint until their hand hurts every day. It's all work related for them. Yes... some people do work for real long hours and are not wasting most of their time. I think it's more the people who are not doing work chasing rewards but doing the work because they genuinely love it.

Use https://www.rescuetime.com/ and you can track your time spent working and easily block distractions so you can focus.