Calibrate internal capacitors for the 32kHz xtal

Hi

I had a device that did not start up - because it was waiting for the 32KHz clock to be stable. 

So I tried to change the setting below from 15pF to 5pF and it started fine.
&lfxo {
    load-capacitors = "internal";
    load-capacitance-femtofarad = <5000>;
};
Is there a suggested way to calibrate this value for a given Xtal?

Br

     GoodOld

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