How many hours it will take to descend on foot from West Peak to Donggoukou, West Cable car

My friend and I are planning to hike from Wamiaogou, the lower station of North Peak cable car to all peaks and descend from West Peak to the Donggoukou the lower station of West Peak cable car (2 days 1night)
1) I believe the route will be like this Wamiaogou - North Peak - Middle Peak - East Peak - South Gate - Plank Road - South Peak - West Peak - Middle Peak - Donggoukou. Is it right?
2) We will stay one night at any hostel available since I cannot find any online reservation for hostel there. Can we just do a walk in?
3) How many hours it will take to descend on foot from West Peak to Donggoukou? We want to do both actually trekking or use cable car or do both descend on foot, ride the cable car up and descend again. Yes a little bit crazy thing to do.