At the start of campaign mode, Ajay Ghale returns to Kyrat to spread his mother's ashes. After being captured by Pagan Min, you will be taken to a personal room. Wait in that room for thirteen minutes. Do not attempt to escape or leave. Eventually Pagan Min will return and escort you to where you can leave the ashes. Enter the tomb, place the urn containing ashes, then leave with Min in his personal helicopter. The game has now been completed in thirteen minutes.