Curling teams receive a specific allotment of thinking time (term used in rules) to complete the delivery of their stones.
World Curling Federation handles the timing of games in section C6. Each team is given 38 minutes for its ten ends, or 30 minutes for its eight ends, with alternative times for wheelchair or mixed doubles, and additional time for extra ends.
A team's clock runs from the instant all stones have stopped moving or left play during their opponent's previous stone, any violations have been corrected, and the opposing team have moved off the playing area or house. It stops when their own current stone passes the tee line.
Since each team uses eight stones, a ten-end game allows 28.5 seconds per stone. Teams may desire more thinking time left towards the last stone of an end or the last end of a game, so tracking is important, especially as a team must forfeit if their ends are not completed in their time.