Final answer:
Implantation is the process in which the blastocyst becomes embedded in the endometrium of the uterus and it occurs around day 8. The implantation process can take 6 to 12 months to complete.
Step-by-step explanation:
Implantation is the process in which the blastocyst becomes embedded in the endometrium of the uterus. It occurs around day 8 (source). The implantation process involves several steps and may take 6 to 12 months to complete (source). During implantation, the blastocyst adheres to the uterine wall via trophoblast cells and implants into the endometrium (source).