Rigid Gas Permeable (RGP) contact lenses are typically designed for daytime wear, with standard recommended wearing times ranging from 10 to 14 hours per day, depending on individual corneal health and the specific guidelines provided by your optometrist. New wearers must follow a gradual adaptation schedule starting with only 3 to 4 hours on the first day, adding an hour daily to allow the eye tissue to adjust. Sleeping in standard RGP lenses is strictly prohibited due to risks of corneal hypoxia.