It depends on who the seller is and how far away the wig is being shipped from. I usually buy cosplays from amazon but I always make sure the seller isn't too far away. For example, the closest seller i've ever found is from canada (I live in america). Also there should be a contact number they offer so you can contact them if there's any trouble or you have a special request.
have a lovely day!! ଘ(੭ˊ◕ᵕ◕ˋ)੭†