GCF, I think 6 years is a long time too... but that is just a personal opinion because I'm excited about this project and cant wait till its completed... However this doesnt change the fact that 6 years for such a big complex is a realistic estimated completion time... Just look at the new skyscraper that will be built in Paris, it will not be completed till at least 2015..
If this project was just a single tower, of course it would have been constructed faster... But we should have in mind that this is not just a tower, it is a complex of towers: 1 of 42 floors, and 2 of over 20 floors.. Plus a big mall, and 6 underground floors... Thats pretty big.. 300 000 m2