The problems of critical time systems functioning, which consisted with time depended behaviors and dynamic resources usage (allocation), have been subject to deep research for system performance evaluation, as well as planning, scheduling, time sinchronization, or/and initialization management, resources access control and systems infrastructures convergence. In this article we argue the formalism of stochastic automata, which functioning at group, together with possible specification of “critical time systems” or “ŗeal time systems” definitions in context with dynamic and stochastic systems behaviors. Detailed behaviors, consisted with functional, logical, topological and determined systems functioning procedures can be establish at macro-models [2] and oriented graph procedures models [4 ] levels. Mathematical approach was proposed, which generalize determination of “critical time” definition as self-organization time systems infrastructure for final decisions accept as well as shows possible tracks for systems optimization and design.