I made a yellow cake last Friday night and iced it the next morning.
Today is Wednesday, and it's been covered in a cake carrier, in a 70
degree room since then. So tonight makes it 5 days. I haven't cut into
it yet.

How many more days do you think I have before this cake is stale? Or is
it already?
FYI, the icing has no ingredients that can go rancid.

Thanks,
Sara