If you keep them in good condition and don't apply mascara over them, I think you can use them a handful of times if not more.
HOW TO APPLY
Demand front & center.
Crisscross...your lashes don’t stop! Apply a thin line of lash glue along the base of false eyelashes. Let set for 30 seconds or until tacky. Position the lash close to the base of your natural lashes & gently press down from outer corner inwards. To remove, gently peel off from outer to inner corner of eyelid.
Complete Your Look
lash-hugging gel liner pen
clear adhesive that dries quickly for easy lash application
brightening eye cream to fade dark circles
golden bronze complexion highlighter
"sugar rush flush" face powder