The author seems to enjoy his structure, but organizing my day into 30-minute chunks would drive me insane. I have a hard time getting anything done if I have a meeting on my calendar that I know is going to stop me in 2 hours.
I share with you my structure. This doesn't mean that it's the recipe to success. I feel comfortable with this. If I have a 1-hour meeting, then I make two more 30mn sessions during the night. Anyway, You must find a structure that fit to your personality to maintain your level of commitment in the long-term.
I'm the same. If I know there's something I have to do at a specific hour, I can rarely start working on a new task knowing that I will stop soon. When I work on something I prefer it to be deep work that can last as long as it needs.
Are you into deep work? I made a website where you can track your sessions + data, would love to get your feedback.