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Each player shall receive approximately three minutes per move. When the top of the sand timer is almost empty (five to ten seconds) it is the responsibility of the opponent to tap the top of the timer to ensure that the last few grains of sand flow smoothly to the bottom, and to indicate to the player that there is only a short time left. If opponent fails to do this, and the timer for the player's turn empties, the player has a five-second grace period (after becoming aware of the situation) to make a play.