Francis Wade over at productivity blog recommends separating them in terms of the type of time they demand from you.
What this means that instead of separating them by subject—which can be helpful, but creates a cluttered, imprecise calendar—you separate them by whether they’re busy time, deadlines, or free time. Wade recommends five different views:
- An “activity” view, which is time spent mostly on reviewing your tasks, managing your calendars, and otherwise dealing with the administration of your calendars and to-do lists.
- A “deadline” calendar, which are due dates rather than time spent elsewhere. This calendar is more like a to-do list, showing what you have coming up rather than where you need to be at a specific time.
- A Default calendar, that shows all your repeating appointments or activities. This is what your schedule looks like on a day to day basis, from sleeping to eating to exercising.
- A “hard appointments” calendar, which denotes appointments that require you to be somewhere at a specific time (but that aren’t regular). Dentist appointments, special meetings, and other one-off events that require your presence.
- A “blank time” view, which is “free” time specifically plotted out for unexpected events, catching up on unfinished work, or otherwise planning for things that come up at the last minute.
Wade goes into much more detail , so I highly recommend you check out the article for the full details. It seems like a much more efficient way to calendar all your time in a way that informs without distracting, rather than throwing all your calendars on the same view at once.