If you are selling them, your HD has a guideline. It is always best if you quote HD guidelines to a customer. If anything did happen, you would have done your best to make sure they were safe. I never tell a customer what I would do at home. If they are just for you, use your best judgement. The room temp and time sitting out will be factors to consider. Also, some recipes call for more sugar which will buy you a little more time. If the room isn't too warm, they should be fine for an evening. Remember, if it is a paid customer, they have a tendency to leave things out longer, so a little prevention will be good.
I completely agree with scp1127. Better safe than sorry. Especially if you are selling your products.
I had some carrot cake batter left over from a cake order I made on Saturday. I baked a nice 8" 1 layer cake for my family. I frosted it with a cream cheese recipe from this site (can't remember which one at the moment but I'll find it if you want it), and last night we finished up the last piece. It sat on the counter for 2 days covered with a glass cake dome, and my husband and I survived to tell about it, lol! it tasted great, still moist and the frosting had no funny taste. Of course I would never tell this to a customer.
Most showers don't last longer than 4 hours usually..if that! Shoot, bakeries that sell to the public have their items in unrefrigerated display cases much longer so I don't think I'd worry about it.
They'll be fine. I use the same cream cheese based buttercream recipe that a bakery I used to work for used. Weddings, showers, you name it, they used it and so do I! It stays out and it's fine. If you're that concerned, deliver them cold and let them warm up to room temp over time.
I agree with the people above me that you should follow the HD rules if you are selling these. But when I make cupcakes for friends or family, I leave them out on the counter and so do they. No one has gotten sick from room temperature frosting.
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