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Parkinson’s law is the observation that the duration of public administration, bureaucracy and officialdom expands to fill its allotted time span, regardless of the amount of work to be done.
— https://en.wikipedia.org/wiki/Parkinson%27s_law
My favorite application of Parkinson’s Law is to meetings:
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A meeting will expand to fill its allotted time span, regardless of the contents of the agenda.
— Me