This site has quite a few post on how to clean and re-use bottles. In this community wiki, we learn that by putting foil over the top of bottles and baking them for 60 minutes at 340, we will sterilize bottles. Another mention credits Palmer.
So, given sufficiently baked bottles with aluminum foil tops, the consensus is that the bottles may be stored indefinitely without the need to immerse in a sanitizing solution before filling.
This question is about how long to trust an alternate technique: whole box baking.
Beer cases are prepared with a clean paper towel on the bottom of the case (so any debris in the bottom of the case doesn't come into contact with the bottle). Cleaned and rinsed bottles are placed into the case upside down (inverted). The entire box is placed into a 170 degree oven until the glass gets to at least 170 degrees for one hour [https://homebrew.stackexchange.com/a/10444/1643]. Note that I'm not advocating anyone try this technique, certainly don't leave the kitchen if you do, in case something gets hotter than you expect and fire breaks out!
Now the entire box is removed from the oven and stored in a climate controlled environment (my closet), and left undisturbed.
How long will the bottles remain clean enough to fill without immersing in sanitizing solution? Is this technique as effective as the aluminum foil technique, so allowing the bottles to be filled without further sanitizing no matter how much time passes?