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How does the RTC stay on and counting on the M580 when there is a power outage?

How long will the RTC be running for when there is a power outage?

Product Line:

Clock Back-Up
The accuracy of the real-time clock is maintained for 4 weeks when the CPU power is turned off if
the temperature is below 45 °C (113 °F). If the temperature is higher, the back-up time is shorter.
The real-time clock back-up does not need any maintenance.
If the back-up power is too low, system bit %S51 is set to 1. This value indicates a loss of time when
the power supply was OFF.
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