It depends on a number of factors such as:

Hi, It depends on a number of factors such as how long you leave the curlers in, the heat you use and how soon after you wash your hair. As a general rule, if you use a medium heat so you don't damage your hair, and leave the curlers in for 10-15 seconds each then the curls will last for 3 to 4 days or until you next wash your hair if sooner.