i have the same dewar i think it's just where you keep it it may be different cuz i got my lab 30 a about 3~4 month ago maybe longer and i only fuled it once and weather is very cold in tennessee back then for me at least and there was ln2 left over till like 2 weeks ago i used most of it when i got it and had about 5L left in it....
make sure the cap on the dewar is good and it's in a place that's cold
and my mother in her work they had to fule it every week may be that's because the amount of usage idk i am baned @ work so... yeah,,, GL BRO
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