From Clockwise:

Another way to get more Focus Time is to implement “blackout periods” a la the R Street Institute, a Washington think tank. At the beginning of the pandemic each team would pick a half day each week where workers aren’t expected to respond to any internal communications and may not have internal meetings. “External meetings and doing work aren’t forbidden during this time but people are encouraged to use the time for family and personal business,” R Street President Eli Lehrer told me.