Had to create a city based on 'Boro in 2105 for a fictional games company as part of my University Module. Model had to be 0.5km x 0.5km and have no more than 100,000 polygons (based on next generation technology). It also had to be 1 single solid welded mesh. This is how it was handed in. http://www.deviantart.com/view/28278918/ Unfortunately I ran out of time to texture it, or add any instanced objects (of which we were allowed upto 50,000 polygons attached. It took a couple of hundred hours I would guess, I worked from 29th December to 27th January pretty much solid whenever I wasn't at Uni/Work/Sleeping. Couldn't give an exact number.