Most eye care practitioners recommend wearing Rigid Gas Permeable (RGP) lenses for a maximum of 10 to 14 hours per day, depending on your individual eye sensitivity and comfort levels. When first starting with RGP lenses, wearers must follow a gradual break-in schedule starting with just 3 to 4 hours daily, slowly adding an hour each day to allow the cornea to adapt safely to the rigid material. Overwearing RGP lenses beyond professional comfort limits can lead to corneal irritation, dryness, or tissue strain.