Only for the brave?

The recent concert performance by Christian Tetzlaff's of Bach's complete Sonatas and Partitas for solo violin BWV1001-1006 in Chicago's Orchestra Hall received critical acclaim.
The works, which usually take up a double CD, took 3 and a half hours to perform (including the interval and breaks between movements).
Tetzlaff has amazing stamina, apparently sounding as fresh at the end of the concert as he did at the beginning.

Thomas Zehetmair and Alexander Markov, have also shown similar stamina when performing Paganini's 24 Caprices in one concert. And there was Maxim Vengerov who, back in October 2002, performed a successful and popular unaccompanied violin recital in London's Barbican centre, consisting of works ranging from Bach (an arrangement of the tocatta and fugue for solo violin) to Shchedrin.

But how easy is it for an audience to listen to a complete cycle of Bach or Paganini in 'one sitting?'

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