Parkinson's law
Concise Oxford English Dictionary © 2008 Oxford University Press:
Parkinson's law/ˈpɑːkɪns(ə)nz/
▶noun the notion that work expands so as to fill the time available for its completion.
– origin 1950s: named after the English writer Cyril Northcote Parkinson.
'Parkinson's law' also found in these Oxford entries:

