Services › CLASSIC LASH 2 weeks fill Image 1 of 1 CLASSIC LASH 2 weeks fill $60.00 To qualify for a fill price, you need to have at least 40–50% of your extensions remaining for a 2-week refill extension. Book Added! To qualify for a fill price, you need to have at least 40–50% of your extensions remaining for a 2-week refill extension.