" You have a limited amount of time to get things done during the course of a given day. It follows that you should limit the scope of your to-do list to accommodate this constraint. If you only have four hours at your disposal, make sure the items on your to-do list can be completed within that time frame. Otherwise, you’ll set yourself up for failure. "

― Damon Zahariades , To-Do List Formula: A Stress-Free Guide To Creating To-Do Lists That Work!