Thank you Zimbo. I can do some digging now I have that info.
Having looked at the images on Ewald's site I can add the following to the timeline.
The image of the wreck of N56200 in the airmail-route hangar USA was taken 12 May 2016.
The image of the wingless wreck was taken 17 June 2016
The image of the rebuilt fuselage was taken 26 June 2016
The image of the rebuilt aircraft was taken 8 July 2016 - image cannot be the first one of the rebuilt aircraft though as the one of its first testflight was taken on 7 July 2016.
I can discount date setting errors between the images as they were taken using the same camera.
By my reckoning from wreck to rebirth was no more than 20 days. 17 june to 7 July.
Make of that what you will. I am not qualified to say if those timings are reasonable or not.