Eyelashes are very similar to hair in that they are always in the process of metabolism and renewal as long as the hair follicle is not destroyed. Generally speaking, after eyelashes are cut, they grow to the same length as the original ones in about 10 weeks. The approximate growth process, whether it is cut eyelashes or eyelashes that have fallen out, usually starts to grow about a week after removal, growing 1-2mm per week, and usually grows to the original length in about 10 weeks. This explains why many people who have their eyelashes removed have to go back to the hospital in 1-2 months, because the growth cycle determines the frequency of follow-up visits, and after growing to their original length, they can usually maintain it for about five months.