Weaning of PPI

I’m taking the PPI for gastritis and esophagatis nearly for more than a year from Feb 2024 until last December 3rd but again started it on December 25 because of Christmas dinner messed everything up.

Recently I was diagnosed with lots of vitamin deficiencies and doctor told me to stop the PPI asap. If I stop the PPI now how many days I can expect the rebound symptoms? Typically when it will start?