Question: How many days does it take an embryo to implant?
Disambiguated questions and answers: question: How many days does it most likely take for a human embryo to implant?
How many days does it take for a human embryo to implant after ovulation?
answer: nine days after ovulation
six and 12 days
Natural Questions answer: between 6 and 12 days (from the Wikipedia article "Implantation (human embryo)")