I dont hack normally but since I moved to abroad and I needed internet connection. and I finish my data in my sim line. anyway it took around 4 hours.
airmon-ng start wlan0
wait a while around 5 or 10 minutes is enough then you will see a lot of adresses on screen. then choose the strong one and give that to this command
reaver -i mon0 -b 7C:D1:C3:CA:47:1A
thean this reaver starts brute forcing and found a password. since then I am using it. dont worry I will buy my adsl line soon :)