I held a grudge for 20 years. It was a half sister that had made my mother cry. Once my mother passed the only thing my half sister and I had in common was gone I stopped talking to her. We eventually did get back together for a brief time when my half brother passed and I went to the wake but eventually lost touch again.
So I have no issues or qualms holding grudges
can do it standing on my head. You hurt me or someone I love and you are in my grudge books for a very long time.