User blog comment:MrSuperSpy/Myra, the Empress of Power/@comment-26055105-20141111003907/@comment-25519324-20141112171737

The specific time delays combined are actually equal to the stun duration period minus the knock-up - 2.5 seconds (0.725s (Q delay) + 0.3s (cast) + 1.25s (E delay) + 0.225 (E cast)). This is done so Myra isn't too rewarded for stunning you and insta-killing her with percent health damage and true damage plus the bonus damage from the ultimate. It also makes her more reliable on the ultimate (which is instant damage in a 250 radius line), which needs correct timing and precision AND THEN dumping everything she has. And for the range of 5750 it's just a number so it's the longest-ranged non-global ability in the game, it doesn't mean anything. :D