The fast brain and the fast work, and the fast chess game! New interesting positions. A time control is a mechanism in the tournament . Time controls are typically enforced by means of a game clock.
In the case of chess, the World Chess Federation FIDE has a single, classical time control for most of its major events, 90 minutes for the first 40 moves, followed by 30 minutes for the rest of the game, with an addition of 30 seconds per move starting from move one. The Candidates tournament and the World Championship are currently played at 100 minutes for 40 moves, followed by 50 minutes for 20 moves, followed by 15 minutes for the rest of the game, with a 30-second increment starting from move one.