How long will yeast live

Calder said:

The yeast will be fine.

You probably want to drain off the liquid and add some more starter wort to get the yeast working again. It will also give you confidence the yeast are fine.

Think about it, bottles can sit for a year at room temperature and still have viable yeast in them. I regularly ferment for 3+ months, and there is still plenty of yeast to carb the bottles.

UV exposure? I've never heard it be a problem for yeast. Yes it can affect some hop compounds and make a beer skunky, but should not be an issue for yeast.

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ColoHox said:

Also, UV exposure most certainly affects yeast.

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emyers said:

I can't argue with the referenced link. Maybe they exposed the yeast to high amounts of UV radiation. Yeast survives in the open, it naturally occurs in the open. Natural fermentation of cider is with the yeast from the skins. Natural fermentation of wine is with yeast from the grapes. We capture yeast from the air for 'wild' brews (and a lot of is it sacc yeast).

Maybe high amounts of UV radiation affect yeast, but I think just sitting in the window is not going to do anything to it.

Humans are affected by UV radiation. If we sit too long on the beach catching rays for way too long, we might get skin cancer, but walking about in the open is not considered harmful.

For the OP ... Your yeast will be fine.

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