ASLSP - "As slow as possible"

I usually wince when I read about "personal productivity". It seems the antithesis of what life is for. So, it is a joy to read about the performance of John Cage's work Organ 2/ASLSP, now being played in the minimally restored ruins of the church of St Burchardi in Halberstadt. His instructions were that it was to be played "as slow as possible". But how slow is that? In Halberstadt, the performance will last 639 years until 2640, with an interval in 2319. One week ago, on 5th January, another chord was begun. The organ is being built as the performance unfolds. I missed the performance on January 5th, but another opportunity will occur on 5th May 2006, when the chord will end. Then you must wait until 2008. Perfect.
The website design is very fine and particularly apt for the project. The gallery offers a moving-camera view of the minimally reconstructed church.