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Is this the legal advice that was leaked?
https://twitter.com/BrexitCentral/status/1069473309526581248?s=19
That contains the line
the WA [Withdrawal Agreement] could have effect for approximately 150 years from the end of the TIP [Transition Implementation Period]
Though that line relates to the odd case of someone affected by the WA having a child late in life, who then lives for a long time.
There is a belief that Cox said something along the lines that the backstop is a bad idea and will tie the UK to the EU in perpetuity as the backstop will be forever ongoing.