User blog comment:Contractas1/Ashe - The most ignored concept of a carry?/@comment-10256611-20140107162339/@comment-10256611-20140107174147

It's not always 3.5. It has to travel at least 2800 units (you have that for you, I was almost sure 3500, but still), so basically, you have to engage to use its full potential. Using it during a teamfight will almost NEVER cause it to stun for full duration.