How can we track in Process Model whether the user clicked on save draft or not in User input Task

Hello [mention:387ffc3f60b54b5790f1a95a338fc7c7:e9ed411860ed4f2ba0265705b8793d05] 

You can make use of the exception tab in the process node and redirect the process to the end node given a particular time.

Below is an helpful document to achieve this.

Exceptions in a Process Node

I am assuming a New record creation is via record action.

There is no way to detect the click on save drafts IMO. I would recommend disabling it and making your own button which you can then track.