Eyelashes, like the hair on your head, go through a growth cycle that consists of three phases: Anagen Phase: This is the active growth phase, where your lashes are continuously growing. It typically lasts for about 30 to 45 days. Catagen Phase: In this transitional phase, eyelash growth slows down, and the hair follicle starts to shrink. This stage typically spans a few weeks.. Telogen Phase: This is the resting phase, where the lash stops growing and eventually falls out. This stage may extend over the course of several weeks.