Size. Any more and the book would be too big to carry around.
Even more, we didn’t want to make it fit into a calendar month. A huge component of Define My Day is routine and we needed to encourage it in our design. For instance, we want you to go through the same process each day, week, and month. If you begin Day 1 of Define My Day on a Monday, Monday will always be the first day of each book and week. Your review days will always occur on the same days.
If we included 30 or 31 days, your last day would always change. You would begin a new book mid-week or be tempted to wait to begin the next one the next Monday, breaking your routine. We do not want our users to line up their Define My Day planner with their calendar. We don’t want you to wait for the beginning of a month to start. We want you to see life independent of the calendar month.
Every component of Define My Day has been created with one reason in mind: to encourage you to become more focused on your priorities. Having a healthy, stable routine is key.