Google’s 20 percent time policy encouraged employees to spend one-fifth of their working hours on projects outside their primary assignments. The policy became a well-known example of Silicon Valley’s experimental workplace culture.
The idea was intended to give engineers room to explore new products, technical approaches, and customer needs without waiting for a formal management assignment. Google has credited the practice with helping inspire products including Gmail and Google News, although the company’s implementation and expectations changed over time.
The phrase does not mean that every employee automatically received a fixed day away from regular work. Managers, deadlines, and team priorities still affected how the policy operated. It is also different from formal research-and-development work, which is usually part of an employee’s assigned responsibilities.