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The length of time an action will take to complete.
The habit of filtering possible actions based on whether the time you have is sufficient to complete them.
The next defined physical, visible action you will take to advance some purpose.
Examples include:
Anything that has a day or time context to it should be placed on your calendar.
An action that needs to happen on a specific day, but not necessarily at a specific time. For exampe, "call Dad for his birthday".