Even if I tried, I wouldn't be able to it better, completely agree with it. Even I am atomic and I know, if I hadn't been patient with my life, I would have left the game in industrial age and if upgrade times were in limit there would be so many more active players today than there are. The upgrade times are insane. 3-4 days of upgrade time per building are fine, but 9-10 days is just ridiculous. I even think for latest age they should be peaked at around 10 days. Anything more than that is just ridiculous.
Also, I think the oil resource cost for some buildings need to be rescaled like factory lvl 4 is 200,000 and lvl 5 is 210,000 it should be rather 175,000 and 215,000 much more spread out. In game I don't think there are any buildings that you can upgrade around 140,000-170,000 oil. It has to be much more smoother.