“Contingency time is useless wasted time, right until you need it.”
Source: The Laundry Files, The Labyrinth Index (2018), Chapter 8, “A Game of Vampires” (p. 236)
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Charles Stross 211
British science fiction writer and blogger 1964Related quotes

“The time you enjoy wasting is not wasted time.”
From Marthe Troly-Curtin's Phrynette Married (1912). Misattributed to Bertrand Russell due to an ambiguous entry in Laurence J. Peter's Peter’s Quotations: Ideas for Our Time (1977) http://quoteinvestigator.com/2010/06/11/time-you-enjoy/
Misattributed

“The NET is a waste of time, and that's exactly what's right about it.”
Name of an article http://www.voidspace.org.uk/cyberpunk/gibson_wasteoftime.shtml he wrote for New York Times Magazine (14 July 1996)