This paper intends to be a further step towards identifying common performance metrics for task-oriented human-robot interaction. We believe that within the context of human-robot interaction systems, both human and robot independent actions and joint interactions can significantly affect the quality of the accomplished task, thus proposing a generic performance metric to assess the performance of the human-robot team. In our previous work, and toward efficive modelling of such metric, we proposed a fuzzy temporal model to evaluate the human trust in automation which directly influences the interaction time that should be directly and indirectly dedicated toward interacting with the robot. Another fuzzy temporal-based model was also presented to evaluate the human reliability during interaction time. In this paper, the model is then extended to accomodate for multi-robot scenarios. Sequential and parallel robot cooperation schemes with varying levels of task dependency are considered.