There’s another reason you don’t want to use too much lash serum, especially during individual applications: The results took about 6 weeks to really notice a good change in my eyelashes. Latisse In Reno Sparks Hidden Valley Nv Reno Nv Janiga Mds I drop one small drop into the container top. How many weeks does it take for latisse to work . Latisse is effective for as long as you use it, meaning you can keep your. Almost everyone who tries it notices an increase in length and sometimes an increase in thickness and darkness. Latisse can take several weeks to up to several months to show full results. If you miss one application, do not double the next application.according to most reviews of latisse for eyebrow growth you will find online, most users see positive brow hair growth after at least four weeks. If you don’t see any changes in your eyelash length, thickness or color after two months, it’s best to talk to your healthcare provider. Latisse works as long as you cont...