Well the right answer is... anytime you want! Agile Lashes The HanaDolly 7 minute lash routine was created to give you full control over your lash beauty. So you only need to put on your lashes when you actually want them instead of being 'stuck' with the same look for a whole month. Our lashes last around 5-7 days per wear, and can be re-used with proper care! See our lash guide for more details. PRIME Lash Serum We do recommend using our PRIME lash serum daily to get the full results. The reason is that an estimated 35% of your lashes are in the Anagen (active growth) phase at any one time. So applying the lash serum daily over 4-6 weeks will help to ensure that your full lash line has received the proper stimulation to boost growth as they enter the Anagen phase. You can even use it when you're not wearing any falsies, or if you're currently still waning off normal extensions!