Cyber attacks range in magnitude from large scale attacks to more targeted small attacks. Ill-timed and ill-planned sequence of large scale cyber attacks may weaken the power of the ones next to it. Small scale targeted cyber attacks will mostly have one shot opportunity because of the countermeasures taken by the defender soon after the attack. In this paper, acceleration trend of the progress of targeted development project will be the determinant factor to decide when to launch cyber attack. This paper examines the timing factors in large scale cyber attacks and targeted small scale cyber attacks.