Parkinson's Law: work expands to fill the time available

C. Northcote Parkinson published his famous observation in a 1955 essay in The Economist: 'Work expands so as to fill the time available for its completion.' He proposed it to satirise British civil service bureaucracy, but it describes a universal pattern. Research by Erin Reid at Boston University found that employees who worked 80-hour weeks were no more productive than those working 50 hours — they were simply filling time. The practical implication is that artificial constraints — tight deadlines, compressed sprints, public commitments — improve output not by adding pressure but by forcing prioritisation.

Source: Parkinson, The Economist (1955); Reid, Organization Science (2015)