Jinshanling to Simatai West and Simatai East

We plan to hike from Jinshanling to Simatai west. I know that the classic trail is to start from Zhuanduokou pass and head to Kyryl tower and east five-window tower, leaving at the east gate of Jinshanling. How long would that hike be?
I wonder also, if we could walk from Zhuanduokou pass until the actual section of Simatai (east) and leave from there. If that is possible, how long is that walk?
We will be there on february/2018.
Thank you!