Reconcile hanging at 99% complete

My full recon operation starts normally.

Then the following status report stays the same for hours:
Full reconcilation in progress: reconciling accounts (99%)

The task results object reports timings of ~6800sec of "processing" yet finishTime-
startTime = 78751sec (x11 as long).

The recon configuration does not use any post recon workflow.

What else could cause a recon to run smoothly until the post-processing/cleanup?

ANSWER:

There are a few things you can do:

  -  Look at debug/Show_Reconciler.jsp page when it reaches this state. This 
     provides a window into the workings of the reconciler; you'll be able to see 
     what the threads are working on.

  -  Turn on tracing. I'd suggest level 2 tracing on the following classes: 
     com.waveset.recon.ReconTask
     com.waveset.recon.Response