The manager's schedule is for bosses. It's embodied in the traditional appointment book, with each day cut into one hour intervals. You can block off several hours for a single task if you need to, but by default you change what you're doing every hour.
Most powerful people are on the manager's schedule. It's the schedule of command.
How do we manage to advise so many startups on the maker's schedule? By using the classic device for simulating the manager's schedule within the maker's: office hours.
When you're operating on the manager's schedule you can do something you'd never want to do on the maker's: you can have speculative meetings.
ambitious projects are by definition close to the limits of your capacity. A small decrease in morale is enough to kill them off.
I used to program from dinner till about 3 am every day, because at night no one could interrupt me.