How long should you wait before deleting a deceased person from your contacts? Should you even delete them? What factors come into play when deciding?

I don't delete people. Its too final.
I dont keep them intentionally but will do it a year plus later
After x time passes and I notice it I'll delete them
I delete them within a week or two. Move the grieving forward!
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How long should you wait before deleting a deceased person from your contacts? Should you even delete them? What factors come into play when deciding?
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