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How many days does it take for the fertilized egg to implant?

By Silvia Azaña Gutiérrez B.Sc., M.Sc. (embryologist).
Last Update: 10/06/2026

Embryonic implantation lasts approximately 4 or 5 days. This period begins when the blastocyst hatches and ends when the trophoectoderm has completely invaded the endometrium.

Therefore, embryo implantation occurs between the fifth and eighth day of embryonic development. This means that this is the time it takes for the embryo to implant after fertilization of the egg by the sperm.

Read the full article on: What is embryo implantation and when does it occur? ( 44).
 Silvia Azaña Gutiérrez
Silvia Azaña Gutiérrez
B.Sc., M.Sc.
Embryologist
Graduate in Health Biology from the University of Alcalá and specialized in Clinical Genetics from the same university. Master in Assisted Reproduction by the University of Valencia in collaboration with IVI clinics.
License: 3435-CV
Embryologist. Graduate in Health Biology from the University of Alcalá and specialized in Clinical Genetics from the same university. Master in Assisted Reproduction by the University of Valencia in collaboration with IVI clinics. License: 3435-CV.