Zong Biometric Promo, What's The Duration?

Yesterday I got my Zong SIM verified through biometric process and as incentive Zong offered me Unlimited On-Net Calls, 5000 SMS and 500MB of Data, but they didn't mention for how many days this offer has been given?

Anybody else got the same incentive from Zong?

plz have a look , i think they are for 7 days only

http://www.pakistanitech.com/2015/02/re-verify-zong-sim-biometrically.html