JAB, I'm unaware of any 5.5-km minimum for F1. I think Appendix O would basically put it at either 3.5 or 3.7 km.
If there were such a thing, Shanghai, Bahrain, Qatar, Dubai, Istanbul, and India wouldn't meet it. That's two current, two (recent) former, and two potential circuits. That 5.5-km assertion just sounds absurd, and I'm aware of no codified basis for it.
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