Blender 2.78.4 (e8021f5)
Koro
1 Tile: 11 minutes 30 seconds
2 Tiles: 10 minutes 10 seconds ****
6 Tiles: 10 minutes 35 seconds
64x64: 29 minutes 45 seconds
Barcelona
1 Tile: 6 Minutes 31 seconds
2 Tiles: 5 minutes 50 seconds ****
4 Tiles: 5 minutes 44 seconds
6 Tiles: 5 minutes 54 seconds