After the main time is depleted, a player has a certain number of periods (for example five periods, each of thirty seconds). If a move is completed before the time expires, the time period resets and restarts the next turn. If a move is not completed within a time period, the time period will expire, and the next time period begins. This is written as <maintime> + <number of byo-yomi time periods> of <byo-yomi time period>. Using up the last period means that the player has "lost on time". In some systems, such as certain Go title matches, there is no main time; instead, the time used is rounded "up" to the nearest whole increment, such as one minute, and the actual counting of time occurs toward the end of one player's time.