How long does it take for an eyelash to grow out?

A natural eyelash typically takes between 6 to 8 weeks to grow. Eyelashes have a cycle where they grow, rest and fall out. It is important to remember that this time can vary from person to person, depending on factors such as genetics, age and health. If you have eyelash extensions, the natural lashes that the extensions are applied to will also follow this cycle, and some will fall out when the natural lashes fall out.