Skin Doctors Eyelash & Eyebrow Serum 6mlANAGEN GROWTH PHASE 4 10 weeks Lash actively grows at 0. 12 0. 14mm per day. The longer the lash stays here, the longer it becomes. CATAGEN TRANSITION PHASE 2 3 weeks Lash hair follicle shrinks, detaches itself from the blood supply and lash growing stops. It will wait to enter the next phase TELOGEN RESTING PHASE Can be more than 3 4 months Old lash rests while a new baby hair begins to grow inside the follicle. the old lash will fall out naturally.