I asked the guy about evaporation rates and he said about 1% a day, which sounded a little strange cause we talked about the pressure build up and auto venting. I think I'd have to use it constantly to prevent venting, and, much as I might like to, reality would prevent it lol Didn't realize 10 days was about all I'd get
Still hoping to find a smaller dewar and then get him to give me the sweet price per litre he gave me today for the big one.. anyone got any leads let me know..... please