Given the sidemen, and checking Thorbjørn Sjøgren’s discography of Dexter, that must be:
24 February 1963 - Danish Radio Concert Hall, Copenhagen, Denmark
with Axen, NHØP and Schioppfe
-Three O’Clock In The Morning
-Soul Sister
-Night In Tunisia
1 August 1963 - Molde Kino - Molde Jazz Festival, Norway
with Iversen, Amundsen and Christensen
-Scrapple From The Apple
That would would make roughly 40 minutes, though.