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New yeast didn't come in the mail when expected (Prestige WD).

I had 2 cups of wort that I had started with my cultured yeast so I pitched that in my next batch and added 1 qt of spent grain from the last fermeted mash. I saw no difference in how it fermented than the other batches. If anything, it had a slightly higher alcohol content after fermenting. Running it now in my pot still.

This is a cooked corn/rye/malted barley mash.

So, one question I have is if stored a quart or so of the spent grain from a fermentation, how long could I store it in the fridge and still have good yeast in it?

If you feed it once a week (a dilluted sugar solution) -- you can keep it going forever.

Aidas

p.s. just toss a bit of it when you feed.

I've been keeping yeast now for at least 15 generations. I give the spent grain a wee bit of sugar water and keep it in the fridge. When it's in the fridge it's dormant, no need to be feeding it. The day I'm mashing I take it out and set it by the wood stove. In a couple hours it comes to life and I add it to my mash.