David Edmonds is co-author of Wittgenstein’s Poker – this focuses on a ten minute argument between Karl Popper and Ludwig Wittgenstein. His other books – also written with John Eidinow – include Bobby Fischer Goes to War (on the notorious chess match between Bobby Fischer and Boris Spassky) and Rousseau’s Dog, which dissects the famous quarrel between David Hume and Jean-Jacques Rousseau. His day job is making radio documentaries for the BBC.
Nigel Warburton has written a number of books including Philosophy: The Basics, Philosophy: The Classics (some of which is available as a podcast) , Thinking from A to Z and The Art Question. He is Senior Lecturer in Philosophy at the Open University. He has also made a number of programmes for BBC Radio 4, writes a weblog called Virtual Philosopher and regularly leads courses on the philosophy of art at Tate Modern.
Here is are links to scores of interviews from these gents. Most are 20-30 minutes. All are valuable (to varying degress of course).