I don't process fruit for anywhere near that long. I only do fruit for 20 min. As long as it seals it's fine. Same with my tomatoes. We use a tbsp. of lemon in the tomatoes to make them more acidic. Again - as long as they seal it's all good. I wouldn't do veggies without a pressure cooker and I'm a little scared of them. Had a school teacher that had one blow up in his face and while I'm sure they are much safer now - they still scare me. He was a real mess. I canned a whole salmon one time. We had so much we were giving it away. Once was enough. We prefer canned tuna and when I can buy white tuna for $1.29 a can, it's not worth the trouble to can it.
Haven't made pickles for years and it never occurred to me to re-use the brine so I will have to try it.
Vanisle when we re-used the Vlassic pickle juice it was never meant to keep for a long time. It was just a quick way to get another big jar of pickles. We will keep them in the fridge till they are gone......God, they are half gone now. What the hell, food is meant to be eaten.