Adjusting to Rigid Gas Permeable (RGP) contact lenses typically takes anywhere from one to three weeks of consistent daily wear. Because RGP lenses are hard and rest directly on the cornea, new wearers experience a foreign body sensation, mild irritation, and excess tearing during the initial adaptation phase. Eye care professionals mandate a strict break-in schedule—starting with just a few hours on the first day and increasing wearing time by an hour daily—to allow the eyelids and corneal tissue to adapt comfortably.