Every second, approximately ten metres of the Dralh Sea was converted into the Sandy-Grey Void. From the vertex of the Sandy-Grey Void Octagon to its centre, where the ship was at, the distance measured to about 5.33 kilometres.
This equated to about nine minutes for the ship's location to become part of the Sandy-Grey Void. Of course, as the Sandy Grey Void spread from the vertices of the octagon, they spread across the surface first, with the depths taking a bit more time, since the sea bed was at a depth of two kilometres.
The effects of the Sandy-Grey Void unleashed by the Sandy-Grey Bombs would last for 24 hours. And the grey sand would be as potent as the one bordering Sumatra Continent.
Of course, if it was left to grow freely, it would consume a catastrophic volume of the Sumatra Continent within 24 hours. With a growth rate of 10 metres per second, if left to expand radially like a circle, it would grow to become a circle with a ginormous radius of 864 kilometres.
