Purpose: To assess how the reliability of workers and equipment involved in construction processes influences the productivity of these processes and, consequently, construction time. To identify and demonstrate the identified patterns of influence using standard sets of construction equipment. This will enable construction organization managers to use the results obtained. Methods: The construction process under study was presented in the form of a structural model that reflected the quantitative and qualitative characteristics of the process. Formulas from the theory of large systems, queuing theory, reliability theory, and probability theory were utilized as mathematical instruments. Results: A structural model of the construction process was developed, providing a foundation for calculations that assessed productivity and the timeframe for completing construction work. These calculations incorporated a reliability assessment of the components involved in the construction process. A series of calculations was conducted to establish graphical dependencies between productivity and work completion time. These calculations were made based on the reliability of typical construction excavator units with the most commonly used bucket sizes. The present study employs graphical dependencies to identify and assess the influence of the reliability of construction process elements on the timing of construction work. Practical significance: The construction manager’s primary objective is to execute construction processes with optimal quality and on schedule. The present regulatory documentation does not take into account the impact of construction component reliability on project completion time. The calculations presented in the article are conveniently summarized in tables. The utilization of graphic dependencies provides a clear visual representation of the influence of the reliability of the construction project components on its completion time. The components under consideration are considered to be standard, and the soil excavation volume is completed within a standard timeframe and is universally applicable for transformation. Given the construction manager’s expertise in his machine fleet and the project’s scope, the study’s findings can be utilized to accurately predict the project’s completion deadlines, ensuring reliability. Should further modifications be required, they can be made