How long does it take for Freezer burn to set in?

I would say that it all depends on if the container is sealed really good. We have froze some things in ziplocs also and it still got freezer burn on it after a while. We had some cheap ziplocs also and the food got freezer burned in a couple of weeks.

Freezer burn is caused by air getting to the food that you freeze. So if your pork is getting any air it will freeze get freezer burn in a short time. You can't get all the air out of those freezer bags. Here's what you should do. wrap the food in 2 or 3 layers of plastic wrap forcing all the air way from the food. You can then put the food in a freezer bag or one of those Recycle Cereal Bags. Aluminum foil is one of the worst things to store food for the freezer. it can get holes in it letting air get to the food. Since your pork is now frozen I would take it and wrap it in several layers of plastic wrap then the next time your at the grocery store invest in some freezer paper as well as some heavy duty plastic wrap or even the Glad seal wrap. The kids that you press and seal. for soups you can put it in saved plastic tubs and put the plastic as close to the food as possible to keep the air from the food. You can get more information here http://www.mylot.com/nr/newresponse.aspx?p=1&qid=1419594