If you are planning to put the jars under vacuum, I'd guess it'd last quite a while. Quite possibly a month or more. That was not really a concern though because we go through the stuff so fast it doesn't get a chance to go southI know this is an old thread Robert, but I just stumbled on it and want to make this for gyros. How long do you think this would last in the fridge in a vac packed jar?
Robert