We prove a sufficient CFL-like condition for the L^2 stability of the second-order accurate finite volume scheme proposed by Remaki for the time-domain solution of Maxwell equations in heterogenous media, with metallic and absorbing boundary conditions. We yield a very general sufficient condition, valid for any finite volume partition in two and three space dimensions. Numerical tests show the potential of this original finite volume scheme in one, two and three space dimensions for the numerical solution of Maxwell equations in the time domain.