Reminders alert you to upcoming calendar items such as appointments and meetings. By default, reminders occur 15 minutes before the start of these calendar items. However, you can increase or decrease the default reminder time.
Note: Even when you change the default reminder time, you still have the choice to specify a custom reminder time for each calendar item that you create.
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Click the File tab.
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Click Options.
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Click Calendar.
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Under Calendar options, next to Default reminders, click a new time.
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Click OK.