As it's an older render I'm not really sure. Initial set-up of the scene was fairly easy, getting the overcast right took a few tries in the cloud editor.
The render itself kept my PC cooking probably for a few hours, after that it went through the Photoshop mill for final color corrections, level adjustments and the like.

Overall not really that long, probably pales in comparison to my latest submission where the 3d render alone took 14 hours.