In some High level View Types (Year, Quarter) users might want to only see Calendar Weeks and not a Drill down to Days.
AS IS:
View Granularity
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Day → Hours
TwoDays → Hours
Week → Days
Month → Days
Quarter → Days
Year → Days
TO BE:
Day → Hours
TwoDays → Hours
Week → Days
Month → Days / Weeks
Quarter → Days / Weeks
Year → Days / Weeks