In an environment characterized by multiple agents and uncertainty in project duration, stakeholders endeavor to strike a delicate balance between minimizing the present value of collective project expenditures and maximizing overall resilience. This study initially defines the research problem and analyzes relevant theories. Subsequently, it delves into the intricate interplay between the present value of the owners costs and robustness, drawing upon multi-agent characteristics, ultimately constructing a sophisticated model for project group robustness. Furthermore, this study explores methods to enhance the stability of cost present value under uncertain conditions and develops a trade-off model. Finally, through case analysis, a series of management insights are articulated. The findings suggest that a trade-off relationship exists between the present value of costs and robustness when the duration extension remains constant. Beyond a certain threshold, this relationship evolves into an accumulative one. Even when varying durations are taken into account, a trade-off persists between these two factors. As the proportion of resource occupancy costs diminishes, any potential increase in duration results in a decline in cost present value. The research findings offer profound insights that significantly enhance the decision-making processes of owners and facilitate strategic adjustments to their project portfolios, thereby accommodating the varied preferences inherent in their decision-making styles.