I am American, but I don't interpret that section to mean that I am working 100% of the time. Actually, I think it means the opposite - as long as core hours are met, I have flexibility to work when the inspiration hits me. I know in my current role, sometimes I get a good idea at 8pm, and I am glad I could sit for an hour or two and knock that out rather than have to save it for 9am the next day. Likewise, if it's 3:30~4:00pm and I'm clearly hitting a rut, I can stop and pick back up a little earlier the next day. Me being the best person I can become means that I have the flexibility to do those other activities as I see fit, because I am not 100% work.