You can keep it there for as long as you own the freezer, I suppose. EDIT: Ah, well, if you’re going to change the question… Now it depends on your squeamishness when you eat. I know some people who couldn’t eat a Pizza Hut™ pizza when it’s freshly baked out of the oven. I’m not one of those people. But you “can” eat that pizza after months, even with that kind of storage. It’s doubtful that you would want to… but you could. What’s going to happen in the freezer, starting from the moment you put it there – in that container – is that the freezing process is going to continue to dessicate the thing. If you want it to be “acceptably edible” after more than a day or two, then you need to have it sealed in some kind of container (Ziplock™ bags are better, but aluminum foil, properly sealed, will work) to contain the moisture in the product. And then… indefinitely.