How long does implantation bleeding last?

It varies. Implantation bleeding can last anywhere from from a couple hours to a couple days. It could be something you see once while wiping with a square of toilet paper, a few times on a pantyliner, or it could be a light flow for one, two, and even three days. It is likely to be longer for first time mothers and shorter for mothers whose bodies have had children before and are “used to” implanting.