Window of time the nRF54L15 chip requires to shut down properly without memory corruption.

I didnt see in the data sheet a specific window of time the chip needs to properly shutdown without interrupting a critical process that might cause corrupted memory. I am intending to use additional capacitors to hold enough charge to shutdown the chip but I couldn't find a minimum time requirement in the datasheet for the chip. If there isnt a defined value is that a "good practice" standard? 

Thank you,

James Prather

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