Bus Chadianzi Bus Station to Jiuzhaigou -prebook, expected time needed

1. As I know, it may take around 8 hours.
2. You are advised to book the ticket in advance, in case that the ticket will be sold out.
3. As I remember, you can buy the ticket at the JZG Bus Station or Jiutong Bus Station and you are suggested to buy the tickets in advance.
4. According to the official website, the bus back to Chengdu from Jiutong Bus Station will depart at 07:05, 07:25, 07:30, 07:50, 08:00, 08:10, 08:20 and 09:30. The ticket fare is CNY140/person or CNY155/person. The bus from JZG Bus Station will depart at 06:20 and 08:30.
5. I’m afraid there is no direct bus operating between two places. You are advised to take a return bus from JZG.

If I want to go by bus from Mt Siguniang to JZG, I have been adviced:

to use the bus from Xiaojin to Chengdu or Dujiangyan by waiting by the side of the road or get help from your hotel owner. (There are two buses from Xiaojin to Chengdu and there are also two buses from Xiaojin to Dujiangyan). Buses go to Chengdu will normally have a stop by Dujiangyan. From Dujiangyan, there is a bus to JZG at 08.00 or 10.20?

Question: Can I make it in time for this bus in Dujiangyan from rilong? I need help planning this route....bus schedule? Taxi?

As the information on the official website of Sichuan Transportation, the bus from Dujiangyan to JZG may depart at 09:40, 10:50 and 12:30. The bus from Xiaojin, Rilong to Dujiangyan may take around 4-5 hours. It may be a little hard for you to catch that bus in time.