We recommend starting out with a light sensitivity test, described in chapter 5. After this test, the advised usage of the device is 10 minutes a day, 3 days per week for a minimum of 8 weeks. After that, you can continue using the device as desired. As your skin acclimates, you can use it for longer and as frequently as desired for up to 30 minutes per day. Always be mindful of how your skin reacts to beauty devices and decrease usage if redness or irritation occurs.