GelColor nail polish lasts for about two weeks, according to OPI, its manufacturer. The exact time depends on the condition of a person's fingernails and how a person uses his or her hands. For example, exposing nails to harsh cleaning products can lessen the amount of time the polish lasts.
Many customer reviews on Amazon.com state that OPI GelColor polish lasted for two weeks or more, even when not applied by a professional. They also caution that, when applying the polish at home, people must use a UV lamp to set the polish and ensure it lasts as long as possible.