China is certainly one of the worst places to do an iron butt. Your average speed will be more around 40/50 km/h than 100. Riding at night is a sure way to look for big trouble. If you hit somebody or being hurt yourself, you'll be in deep shit.

If you have some money to burn, you can come to Zhuhai International Circuit, rent the track for 24 hours and ride one of the race bikes they rent here (600cc). You'll be the first guy alive to have tried an iron butt in China.