I made a blackberry/blueberry jam about 3 1/2 weeks ago. Due to work and school, I lost track of time. The jam came out a little thin (and flavorless). Is it too late to reprocess the jars? It was a double batch so I have about 13 jars. I haven't found anything that says how long you can (or have to) wait before reprocessing. Most articles say wait two weeks to see if it sets up and then reprocess if needed but doesn't say the max "wait" time. The recipe I used was simple: X cups of fruit, X cups of sugar, and 2 pkgs low sugar pectin (since it was a double batch).
Any help is appreciated! :)