A: On average, the eyebrows and eyelashes will grow at a rate of 1/8th to 1/4th inches per month. So, when an individual loses their eyebrows or lashes (and the cause of the loss is removed from the equation)
the lashes or brows are usually restored in 6 to 8 weeks.
The hair in these particular parts of the face grow at different rates (slower) than the hair on the scalp or the body, and generally have different growth phases. The follicles of
the eyebrows and lashes typically have a growth phase that lasts 4 to 6 weeks, followed by a two-to-three week transitional phase, and then a resting phase of around 3 months. At this point the cycle repeats itself.
And as with all the follicles of the body, the individual hair follicles in the eyebrows and lashes are independent in their timing, and may vary wildly. This is why some women have sparse
lashes and brows, and why some women have thicker and fuller brows and lush lashes. It also explains why occasionally you’ll discover that a single hair in your brows has become a mutant and grown to a length three or
more times longer than its neighbors.