Hello Sir. The lubricant eyedrops can be used for as long as you want. But if you don't feel the need to use them or if you don't have any issues of dryness ,irritation, discomfort and if you follow a proper working pattern for Laptop/ Computer /Mobile then you can stop using the Lubricant Eyedrops. So whenever the need is there you can resume using the Eyedrops.