The title shoould be "Estimated size of GTA V map", mods please correct it, my mistake.
If what user Screw the NOOSE posted is true, and it takes him 25 minutes to circle the entire map on a jetski, by my calculations, that would mean that the map is (if looked at as a perfect rectangle) 3,91 x 8,25 km across.
That also seems somewhat realistic given that GTA IV is reported to be 3,2 x 4,8km.
If anyone is interested in the maths behind this, PM me, although I seriously doubt anyone is.
Edited by Angelus031, 13 September 2013 - 06:10 PM.