Аннотация:The differences between the characteristics of pion-nucleus interactions are investigated for two distributions ("constituent" and "yo-yo") of the formation times of hadrons. Statistical simulation of hadron-nucleus collisions and a Monte Carlo version of the quark-gluon string model are used to describe collisions of hadrons. It is shown that the momentum spectrum of the protons in the target fragmentation region is the characteristic most sensitive to the choice of definition of the formation time. The inclusive spectra of mesons and meson resonances in the two models are the same.