from our experience Xian - Beijing last year I propose a distance not more than 250km a day when go through country side and not on expressways.
Otherwise your run in trouble when there is a truck traffic jam, a repair stop or simply bad road conditions.
Furthermore I would advice to stay 2 full days in JiuZhaiGou to really enjoy it and make 1 day a trip to HuangLong terraces.

... I wish I could join ......

passroad from JiuZhaiGou to Huang Long
passroad.jpg

(bike free) Dreamworld JiuZhaiGou
dreamworld.jpg