Author here. I don't factor in lunch (so take away 30-60 min). Also, the 19:30 stop is there as a hard stop. Sometimes I feel drained at 17:30 or 18:00 after a

Author here. I don't factor in lunch (so take away 30-60 min). Also, the 19:30 stop is there as a hard stop. Sometimes I feel drained at 17:30 or 18:00 after a very productive day. In that case, I'm happy to wrap up the day.