1. I tend to replace it every 2 weeks. You are probably better off replacing it every week. I feel a stronger signal with fresh fingernails. You might want to try other DNA sources too such as dried cheek cells on blotting paper. That can last maybe 3 - 4 days.
2. I usually change mine at 2 months and don't notice any difference. I have forgotten and 4 months have gone by. I then do notice a big change with a new DNA sample.
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