I know what I'm talking about. I don't know what YOU'RE talking about, and I'm not convinced you do, either.
Take a moment, Grub, breathe, and ponder this: why would a supplement company put out a product that destroys the protein content of food?
They don't, right? It just breaks down protein, pre-digests it into its component amino acids.
There's a good reason to drink this stuff immediately: there are no preservatives in it. Protein rots REALLY fast. Think "cadaverine". You ever open a ripe protein shaker-cup you forgot in the back seat for a few hours in the hot sun? You see my point.
Now, if you can find me something that asserts the protein is somehow lost or destroyed upon waiting, cough it up and I'll make DAMNED sure to never ever purchase anything with that enzyme added!