There are a few factors in this that make it difficult to determine for everyone. The best thing to do is track when you first start to notice your leg hair again. For me, personally, it takes about two days before I notice the stubble. It takes four to six days for the hair to be long enough it’s embarrassing to go unshaven or without long skirts and full-length jeans. Others notice stubble the next day, and it takes noticeably less time for the hair to be long enough for it to be embarrassing to go without shaving or covering up.
In today’s society, especially Western society, it is seen as unfeminine to go unshaven if you wear short skirts and expose any part of your legs from the ankle to the calf.