Fenghuang to Zhangjiajie/Wulingyuan

I'm planning to visit Fenghuang for the day and then return to my hotel in Wulingyuan. I've found plenty of information on getting to Fenghuang. I'm just worried about getting back to Wulingyuan. I would like to watch the sunset there, but I'm afraid it won't be possible. What is the latest time I can leave Fenghuang by either bus or train to get back to ZJJ/Wulingyuan?