So they're just in a state of quasi work for the entire day in the evenings too? If they spend 6 hours on easy tasks when do they have the time for the hard tasks unless they work something like 12 hour days?

it sounds like they have time to go on a 100+ km bike ride throughout during the day, which isn't work. just going off of what they wrote..

seems like they enjoy what they do and/or enjoy what they do, which is critical for non-morning people