  The long-time asymptotic behavior is studied for a long-range variant of the
Emch-Radin model of interacting spins. We derive upper and lower bounds on the
expectation values of a class of observables. We prove analytically that the
time scale at which the system relaxes to equilibrium diverges with the system
size N, displaying quasistationary nonequilibrium behavior. This finding
implies that, for large enough N, equilibration will not be observed in an
experiment of finite duration.
