Jiuzhaigou Scenic Park is located 450km north to the city of Chengdu. It is one of the most beautiful places in China. It is called the fairy land on earth.
A Jiuzhaigou trip will at least need 2 and half days. To get to Jiuzhaigou from Chengdu, the quickest way is by flying. Check the flights to Jiuzhaigou from Chengdu and other places in China. The flight takes about 1 hour. The drive to the airport to Chengdu is about 30 minutes and the drive to Jiuzhaigou Park from Jiuzhaigou Airport is about 2 hours. So you will spend at least 4 to 5 hours on the transfer from Chengdu to Jiuzhaigou. But it is still quicker than using the ground transfer, which will usually takes up to 10 hours by driving.
Remember the elevation at Jiuzhaigou Airport is quite high at 3500 meters. And in Jiuzhaigou it is normally cooler than in Chengdu. You will need to bring more layers.