Just like it took 8 weeks for you to see the maximum results from using Latisse, so too will it take approximately 8 weeks for your eyelashes to return to their previous length and thickness. The results are maintained as long as you use the product... Sorry.
Latisse is a wonderful product to create thicker, fuller, longer eyelashes. The results will last as long as you continue on the product. Once you stop using it, the results will fade.