How long does a refrigerated cake last?

only 4 a week if it is longer than that then it gets spoiled it also depends on how cold your fridge is too. if it is really cold then yes a week ; if it is warmish than usual then only about five days or so.

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Depends on how long it's been at room temperature.

However, if we were to assume that it has been sitting out for an hour...

I'd give it about 8-9 days safely.

(I've eaten cake that was more than two weeks old, and had no problems.)

Egg & milk are major spoilage factors too.

Check the expiration dates on the ingredients of the cake to determine if it's already spoiling...