form of carry case can sustain upto 30 days at the temperatures required for biological materials rather then liquid nitrogen which (4 days).
I can assure you that their claims about how long liquid nitrogen can be stored are incorrect.
Go into any doctrors surgery. They will have a dewar of liquid nitrogen which they use to burn off warts. It lasts for many many months before they need to refill it.
Or you could simply google:
"How long does a dewar or liquid nitrogen last"
I will leave that as an exercise for the reader.
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