  The semiclassical long-time limit of free evolution of quantum wave packets
on the torus is under consideration. Despite of simplicity of this system,
there are still open questions concerning the detailed description of the
evolution on time scales beyond the Ehrenfest time. One of the approaches is
based on the limiting Wigner or Husimi distributions of time-evolved wave
packets as the Planck constant tends to zero and time tends to infinity. We
derive explicit expressions for semiclassical measures corresponding to all
time scales and the corresponding stages of evolution: classical-like motion,
spreading of the wave packet, and its revivals. Also we discuss limitations of
the approach based on semiclassical measures and suggest its generalization.
