I have a quick question about canned food

I have started mixing a teeny tiny bit of canned food with Tatum's dry kibble in the mornings ONLY just to coat the kibble because she refuses to eat the dry kibble with the Salmon Oil squirted on it

She was ok with it when I squirted it on her raw, but she doesn't like it on her dry (she is turning into a picky little girl

). So anyway, my question is this:
It takes me FOREVER to use up the entire can of food...and of course I cover it with one of those lid covers that are made for canned dog food and keep it in the fridge, however...I have absolutely no clue how long this stuff stays good in the fridge. I have 3 different kinds of canned food and NONE of them tell you what the shelf life is?

It only tells how long it stays good if it is left UNOPENED.
So anyhow, does anyone know how long this stuff stays good after it's been open when it's covered and kept in the fridge? Just checking cause I don't want to be giving the little Miss spoiled food!