Infills 38 maintenance eyelash extensions fall out with your natural lash cycle which is 6 8 weeks so very gradually some lashes will fall so new baby lashes can come through after about 2 3 weeks you will start seeing little gaps where the old ones have fallen and new ones are coming through so at this point its a good time to get infills so your lashes always look nice and full the sooner you return for infills providing all aftercare guide is followed the less amount of time y