After 3 weeks, depending on the condition of your lashes, you may require a full set if there is less than 40% of lashes remaining.
Just like natural eyelashes, the extensions fall out. They needed to be filled up about every 2-3 weeks, therefore it's best to book your infills to take place sooner rather than later as last minutes appointments can sometimes be difficult to find.
A number of things can affect the period of how long the lashes will last, and to make the most of your lashes, avoid any oil based make up products, getting them wet, using mascara or adding any additional adhesives like false eyelashes. The more you care for them, the longer their chance of survival. Your bodies natural make up and lash construct will play a large role - eyelash thickness, volume, and natural oil production levels will be contributing factors.
Should you accidentally get them wet, a gentle blow dry with a cold fan can be used.
Infills only applicable to new set's applied at Elinasworkroom, removal and new set will be needed for lashes applied elsewhere.