Generally, I spend so much time telling about what classes (including descriptions of new ones), what races, what new feats, that not much is left to take care of the world itself correctly. Some more work is devoted to religions, and to some organizations and the working of magic. By the time I have reached this point I am usually bored with the setting and abandon it. In older times I had written maybe 30 or 40 pages on the actual setting, but not recently. Now, I have decided to use published setting, so I can still indulge in compiling classes (34 base and prestige classes fo my next Warhammer campaign!) and races, but the setting itself already exists, so no need to spend time on it...