The Judge has given a time estimation of two days but the decision handed down refers to matters being heard on a rolled up basis.  I believe this means that at the hearing week commencing 28 September 2020 to ensure matters are resolved without undue delay the parties need to be prepared to make their full submissions of any grounds upon which the court are minded to give either permission to appeal or permission to bring judicial review proceedings and the court decides to retain the claim.

HERE IS WHAT FORMER SUPREME COURT JUDGE LORD SUMPTION HAS TO SAY ABOUT BORIS JOHNSON

This a short 2m 40sec audio recording of the podcast.  There is a transcript below and a link if you want to listen to the full interview.

Planet Normal: How Britain went from Blighty to Frighty
https://www.youtube.com/watch?v=F3tUjps3KQo
10 September 2020

Guest
Jonathan Philip Chadwick Sumption, Lord Sumption, OBE, PC, FSA, FRHistS (born 9 December 1948), is a British author, medieval historian and former senior judge. Sumption was sworn in as a Justice of the Supreme Court on 11 January 2012, succeeding The Lord Collins of Mapesbury.

Interviewed by
Allison Pearson and Liam Hallighan