ARGH!!! I'm so short on sleep right now that I forgot that I ran out of eggs last night, and have already mixed all the wet ingredients into a box cake mix. Will it ruin it if I leave the dry and wet ingredients sit for about 45 min while I go get eggs??
Just cover it with plastic wrap, I"m thinking it should be okay!! Good luck!
I think that it will be ok. I did the same thing a couple of months ago and it sat for almost 2 hours before I could get back to it.
I might be wrong, but I read that you should put it in the refrigerator so that the action of the leavening (baking powder) doesn't start ahead of time and then it won't rise in the oven.
I think I read it in a book from Shirley Corriher. I do that with cupcakes. Put the batter in the refrigerator while the first set of cupcakes bake.
I think it will be fine left on the counter, covered. I have let batter sit while waiting for the oven with cupcake batches, or even full cakes and they bake unaffected. Sometimes up to an hour even... You are good, go get those eggs 
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