Plant in a airtight box.

I would feel more comfortable if it's a photoperiod as they can take more stress then an Autoflower. I had flowering plants tied up into garbage bags for 7.5 hours one time, pulled them out and they kept growing fine lol.

It could survive for a while without much problem, but flower is delicate and susceptible to mold if in high humidity. I would only have it in the airtight box for as short as possible. The longer it's in there, the more the plant will breathe and that will spike humidity very fast. If it stays cool, it won't be as much of an issue, but if it is in the sun for a short while in that container, you can run into problems quite quick. You might not see it immediately, but if left too long, you'll probably have wpm or bud rot issues later down the line. Short answer, close it up, move it and open as fast as you can.

Air tight is so problem for quite some time, same for light. They can forgive a lot if its a onetime-event. But dont make it more than 24h, a plant itself produces a lot of RH via transpiration and it can mold sooner or later if you already have buds

Place some h2o2 in there, rapidly evaporates to o2 at room temperature.

12 hours at least, up to 18 would be safe.

Light will be your biggest issue but you also dont want her drying out or freezing this time of year. I would imagine she will be a little wilted but will likely come out of it as long as you dont stress her too to much. Again temperature and light will be the biggest issue. If your going multiple days position her in a way you can check on her once a day or so. Be careful what jurisdiction your in some authorities are harder on the grass then others

I guess that would depend on how "air tight" it really is and how big the box is. Stagnant air will eventually cause wilting and trapped moisture will promote mold. If possible, I'd just try to identify a friend you might trust enough to "plant sit" for a couple days if this is a short distance move. If this is a long distance move(like crossing state lines), it's probably not worth the potential trouble.

I'm sure a plant can survive in a box for prob a day and a half. If the plant is in veg this will put the plant into flowering. I think what your problem will be light more than the box being air tight. Maybe look into finding a small battery powered led light. Like the ones you stuck to a wall in a closet. Won't be a bunch if light but I'm sure for a day or so it will help the plant with it having some light the plant will lrob just think it's a stormy day if there is just a little