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Shanghai's is about 1.2km. The maximum allowed, according to FIA Appendix O, is 2km.
One of my old sesigns, which hopefully I'll figure out how to put into the computer, has a mile long front straightaway (1.6km), and a back stretch (it curves quite a bit) of around 2.5 miles (4km), which I've estimated gives the course a total length of 9.5miles (15.288km).
I love the classic road courses (Nordschleife, Spa-Francorchamps, Bathurst), so a four mile lap with a 1km straight isn't that massive in comparison. I guess it's all relative to what you're accustomed to.
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