Wi-Fi Protected Setup (WPS) is a feature that allows anyone to push a button or enable a software mechanism that will automatically connect your computing device to your router without onerous security prerequisites. Hackers discovered that WPS is vulnerable to brute-force password guessing. Most WPS-enabled routers do not have a guess-attempt lockout protection. Attackers literally have to make only a few thousand guesses (which usually takes four to eight hours) Attacker can break WPS in less than 30 minutes.”]
Source: https://www.csoonline.com/article/2925636/how-to-stop-wi-fi-hackers-cold.html