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As far as I can tell, the blade is 'protected' while it's in the LN but if you are worried about it you can do a temper cycle before the LN. Once out of the LN the blade must be tempered even if you tempered before it went in - tempering is always the last step.
The benefit of cryo happens in the first hour or two but there is no harm in leaving it in there for much longer periods of time ...
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