Several days. The time varies based on the temperature and humidity at the time. The boat carpet project must remain out of rain, bad weather, and the lake while it dries. It must be warm (over 65 degrees) and dry. Do NOT let glue freeze, or use while it or the carpet are cold. If you must install boat carpet in winter, leave your project in a heated shop for several days while the glue cures. Check instructions on the can, on our blog or call us for more details.