i’ve left green tea overnight and drank it. But I wouldn’t leave it for more than 24 hours at room temperature. They say it loses it’s health benefits after an hour or two, but I think 24 hours is pretty safe.

I’ve always lived by this rule when it comes to food or drink…….When in doubt, throw it out. Make some new tea and keep it in the fridge.

Why would you want to know, if it was left outside then its not much of tea anymore, unless you warm it up.