I've just been listening to Bart Roose's very good recording of music by Neusidler (www.passacaille.be) - it has raised the profile of Neuslider for me at least. Anyway, there is one track which clocks in at 12 minutes 38 seconds - Ein sehr kunstreicher Preambel oder Fantasey. Is this the longest 6c piece? Depends how fast you play it, of course! I'm not used to hearing such long pieces on the 6c. Very nice piece, by the way. I usually get very restless listening to 6c recordings - so many short pieces. This makes a change.
Rob -- To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html