There is no time limit on how long it takes for the PCM to learn with a mopar. Even if you use the Chrysler way of doing it via driving the Vehicle it can take a long time. It took my Daughters Neon 650 miles to learn before it was completely ready to be E Tested. One 2004 SRT4 Neon I own took almost as long to relearn. Others have taken a lot less miles to learn, you just have to wait.