The Lycon Hot Wax can grab hairs that are as short as 1mm in length. For my strip wax, hairs as short as 2mm can be removed. Everyone has a different hair growth cycle, but generally I am able to wax hairs that have been shaved 7-10 days prior. However, for the best results, I recommend allowing around 3 weeks of hair growth before you come in for a waxing treatment. There is no need to worry if you have not shaved or waxed for a long period of time. I am very experienced and I will trim the hair if required to a suitable length before waxing.