To calculate the complete fusion cross section over partial waves, as a function of the excitation energy, the maximum value of angular momentum lmax represents the upper limit of that summation. An effective definition for that limit has been checked. Also a comparison with the fusion and critical limits, lfus and lcr respectively, has been displayed. The effects of the nuclear part, of the barrier height and the approximation technique have been checked to approach the best fit of the measured fusion excitation functions