4 hours or so! There are a few scenic stops along the way, each of which you can get off and take pictures. Then wait for your car at the next stop until it takes you to the next one!
Shuangqiao Gou: Ticket + Sightseeing Car: 150 per person, park opening hours: 7.00-15.30, Beauty and Ctrip can purchase tickets online, swipe ID card to enter scenic area. Last sightseeing car at 5 o’clock.

(Note: Shuangqiao Gou is likely a scenic spot or attraction in China)
4 hours or so! There are quite a few scenic spots along the way, where you can get off and take photos at each spot, then wait for the next bus to arrive before continuing on your journey!
Shuang Qiao Gou: Ticket + Sightseeing Car: 150/person, Park Hours: 7.00-15:30, Buy Tickets on Meitu and Ctrip, Swipe ID Card to Enter the Scenic Area. Last bus at 5:00 PM.