How long is a men's lacrosse game?

• The game: "4 periods of 15 minutes duration each".
• Intervals: 2 minutes between the first and second quarters and the third and fourth, and 10 minutes at half-time.
• Ends: the teams change ends at the end of each quarter.
• The clock stops: after a goal and for time-serving penalties. It also stops whenever the ball is dead in the last 30 seconds of the first three quarters, the last two minutes of the fourth and all of overtime.
• Overtime: after a 2-minute break, "4-minute periods of Sudden Victory overtime".
• First goal wins: "The game ends upon the scoring of the first goal, thus deciding the winner."
• A new toss: the visiting captain calls the toss for ends before overtime.
• Each period starts: with a face-off at the centre, unless a team with an extra player had the ball when the previous period ended.
• Timeouts: 90 seconds each, two per half, none in sudden-victory overtime.
• Who may call one: a coach, the captain or the player with the ball, when the ball is dead or the team has the ball in its attacking half.
• Injury: play stops at once for a serious injury or bleeding. Otherwise the official waits, as in a slow whistle.

The glossary has the quarter, the overtime entry, the game clock, the timeout and the injury timeout.

Most of the game runs on a clock that keeps going, which keeps a match to a set length. Stopping it at every dead ball near the end means a team that is behind does not lose its last chance to time-wasting.