According to Baidu map, the whole journey from Shannan City to Zhari Township is about 296.7 kilometers, which takes 8 hours and 38 minutes. Route: S202, G2 19, with 6 traffic lights.
If you don't take the high-speed train, it's 346 kilometers, and it takes 9 hours and 2 minutes to drive. There is not much difference between taking the high-speed rail and not taking it.