This looks interesting:
https://etd.ohiolink.edu/pg_10?0::NO...yton1418340523
It presents a study carried out on a flight sim F-16 Flight Control System
model, so I understand that the latency limits they found between a stable and unstable behaviour are related to the flight sim model they used and do not necessarily reflect what you would find on a real F-16. On the other side, I suppose the investigation method would be applicable to a real case as well.
The relevant paragraphs are 3.12 and 6.2.
Edit: The link to the .pdf file with the full text of the thesis is at the bottom of the webpage and not very conspicuous, so I enclose it below.
https://etd.ohiolink.edu/!etd.send_f...ion=attachment