How much time needed to get from Zhangjiajie village to Yuanjiajie Zhongtian Int'l Youth Hostel ?

1/ We'll come by train from Changsha to ZJJ City at 1 p.m. and then by bus to ZJJ village. Is it feasible to get from there to Yuanjiajie Zhongtien Int'l Hostel the same day ? What is the distance and how long does the walk take ? Is there any transportation available within the park ?
2/ We'll be travelling at the end of April (24-26). Do we have to expect the park to be very crowded ?