On the classical-quantum correspondence for the scattering dwell time
  Using results from the theory of dynamical systems, we derive a general expression for the classical average scattering dwell time, tau_av. Remarkably, tau_av depends only on a ratio of phase space volumes. We further show that, for a wide class of systems, the average classical dwell time is not in correspondence with the energy average of the quantum Wigner time delay. 
Caio H. Lewenkopf and Raul O. Vallejos