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1. For individual ancestors in your tree
2. For minor ethnicities in your ancestry
For me it is after about 5 or 6 generations, 1/32 or 1/64 of my ancestry. That mostly goes back to around the early 19th century, which is conveniently when reliable records began to be kept. It also tends to be the limit of family memory. After that point I don't find genealogy very interesting, for anything that's less than 1% of your ancestry. Then there's the the common non-paternity events, which cast a shadow of doubt over all old genealogical lines.
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