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Recurring Countdown that adds to a variable?


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The sleep() function will wait a specific number of seconds.  It is usually accurate to within a second, but it may wait longer, particularly if the system is under load.  If you need EXACTLY 30 minutes, then that's more difficult.  If you want approximately 30 minutes, then sleep(60 * 30) will work.

Another option is to check time() regularly, and see when 30 minutes have passed.  You can use sleep(1) in a loop to ensure that you only check the time once a second.
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