Even if posting is typically free, running an ad on Craigslist can still be a worthless endeavor if you’re not aware of all the factors involved. Exactly how long a Craiglist ad remains active depends upon its category, its geographical location and whether you’re willing to pay additional fees. Knowing how long ads remain active will help you decide when to make your initial posting and give you time to plan any subsequent ads to make up for the first’s potential failure. Writer Bio