You will enjoy 2d to 4d volume russian eyelash extensions semi permanent individual eyelash extensions the lashes will last as long as your natural eyelash lifecycle which ranges between 60 and 90 days to keep the fullness of your eyelash extensions infills are required every 3 to 4 weeks depending on your personal lifespan and how full you want your lashes to look lashes are available in many lengths thickness and curls so you can have a natural or glamorous look whatever suits