Thanks HU- I think it could last a while as long as you feed the micro herd and have plenty of oxygen pumping into the brew. To my understanding they feed on the blackstrap molasses but I could be wrong. I noticed if you let it go longer than 2 days without adding more molasses its starts to stink in a bad way and has become anaerobic and should not be used. Hope that helps a little but I have allot to learn about the chemistry of organics before I can even begin to understand whats going on down there.
That's the problem I had, I brewed up five gallons and in two days the stuff stunk to high heaven. It was around chopping time for the big girls so I took the stuff and dumped it outside, so it smelled like crap outside my house for a day or two. It is the molasses the bacteria feed upon creating new and more bacteria.
I use that stuff to insulate my walls in the grow rooms. OSB is cheaper is why I was thinking of picking it up instead of the insulfoam. It's about 1/3 the price if you get the foam that's 1/1/4" thick which is what I like to use.
I have two outside walls in my grow room and they are both insulated with foam sheets. Works great.