A new record for me – over 51gb memory used by a single Revit instance

You can never have too much RAM in Revit:

Surprisingly, the model did not crash at this point.

Screencast below shows what happened when I tried to draw a section in this model. I had to click ok and then repeatedly smash Esc key to get out of this loop:
 Open embedded content: screencast.autodesk.com