How long does implantation last?

Implantation of a fertilized egg into the uterine lining occurs in a step-by-step process that takes up to 48 hours, according to ImplantationBleed.com. This occurs approximately nine days after a woman has ovulated.

Implantation can happen as early as three days and as late as 12 days after ovulation, as reported by ImplantationBleed.com. Some women may notice signs of implantation, such as spotting and cramping, and they may mistake them for an irregular period. Some women also report nausea and mood swings; however, many women do not experience symptoms at all. Women who think they may be pregnant should see a doctor for confirmation.