Originally Posted by EebstertheGreat
Speed is indeed reduced by 10% per unit and 1% per tree. Note that this is 10% or 1% of the current speed, not the original speed, so it will never be slowed to a stop.
3000 units per second
lets assume super lategame with 50 stacked megacreeps/summons
0.9^30*3000=15.4613256 units per second, that means the arrow has 113 seconds to make the 1700 distance
so theoretically if the frozen throne/tree is somehow kept alive the arrow can be essentially slowed to 1unit per second, so that there are (from here made up numbers) 100 powershot arrows stuck in midair for the next 20 minutes