For focus time, use focus blocks

Cameron Moll:

Focus blocks are an effective way to leverage flow at work. You can use focus blocks individually or within your team simply by blocking out times in your calendar—daily in small chunks such as an hour or a couple times a week in larger chunks two to three hours or longer. 

Intentionally blocking time for deep work is essential.

See also Shawn Blanc and team on timeblocking.

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