According to the rules of Harn, it appears normally salted foods will last up to 1 week, depending on success of the process. A CS will get you a full week, MS will get you 3 days, MF and CF are, well, fails.
I looked up Jerked meat in the game, as well as in real life, and most sites say jerked meat, outside of a vacuum sealed package, will last "a week to a couple weeks", and also that it is very difficult to make without modern technology. So, CS will get you "couple of weeks", MS will get you a week. MF and CF both end with spoiled meat.