Eyelash extensions shed with the natural eyelash growth cycle, which is 3-6 weeks or sometimes longer. Around the 2-3 week mark you will start to notice gaps and at this time it is best to infill the lashes to keep them looking full.
Ultimately, retention will really come down to the individual’s eyelash growth cycle, application, aftercare and lifestyle. On average, we lose between 1-5 natural lashes per day. This means you can expect to lose up to 21 natural lashes in 7 days and up to 63 natural lashes will have fallen in 21 days.