I was able to get a car license and motorcycle license the same day in Nanjing. A lot depends on where you get the license. Rules are not consistent from province to province, much less city to city.
The biggest issue I found in Nanjing was the visa type. In Nanjing the visa type has to be good for continuous stays "OVER" 90 days. That means a work visa or in relative's visa here. With that and a local address, (I successfully used the Fraser Suites which is basically an extended stay hotel) you can get a drivers license in Nanjing. With a USA motorcycle license, I only had to take the written part of the test and then have the USA license "officially" translated and chopped. (Be sure they add both the Car and the Motorcycle to the translation as my first translation overlooked the motorcycle part. I then hired an officially sanctioned "translator" to help me take the written test. Best 300RMB spent in 7 years of living in China . Took the eye test and license was sent to my apartment within a couple of days. My wife is local Chinese so that helped tremendously. Your ability to speak could assist but you might not want to let them know you can so you can use the officially sanctioned translator. Your call.

I have a Jialing JH600 and recommend it as I am simply too big and fat for smaller bikes. There are of course all kinds of smaller displacement bikes that are recommended here. Just take a look in the forum.

Good luck and let us know if you come thru Nanjing.