<p>The script of 'Wazir', directed by 'Shaitaan' fame Bejoy Nambiar and starring megastar Amitabh Bachchan, Farhan Akhtar, and Aditi Rao Hydari with John Abraham and Neil Nitin Mukesh have cameo roles, took five years to complete, co-producer Vidhu Vinod Chopra said on Wednesday</p>