Here's why:
* Too short: The wax won't be able to grip the hair properly, and it won't be effectively removed.
* Too long: While wax can often remove longer hairs, it can make the process more painful and less effective. It can also lead to hair breakage instead of removal from the root.
It typically takes 2-4 weeks to reach the ideal length after shaving, but this can vary depending on your hair growth rate. If you've been waxing regularly, the hair growth might be slower over time.