Long connection of 17h

If you will go to a third country or region different from the last one you come from after transiting in Shanghai, you qualify for the 24h twov in there. But leaving the airport without a visa for a layover under 24 hours is at the immigration officer's discretion. Some reported that bringing a hotel reservation will help. You can have a try. Good luck. Or you can apply for tourist L type visa to guarantee your trip to Shanghai beforehand.