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The button battery can generally only last for about a week, so it depends on how long you haven't driven your car.
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It also depends on how long you drive your car again. If you only drive for ten to fifteen minutes, the button battery will not be able to charge sufficiently and cannot guarantee normal operation. To ensure lasting performance, it is necessary to charge the battery for at least 4 hours. Since the button battery has a small capacity, the charging time is usually required to be relatively long (it's best to charge it continuously or without interruption).
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If you have driven your car for a relatively long time and the time settings are still repeatedly reset, it could either be due to a faulty button battery or a circuit malfunction.