A significant challenge inherent in multi-hop networks employing Integrated Access and Backhaul technology is the accumulation of latency across the transmission path. Researchers have applied many methods to solve this problem, including routing, network topology optimization, and scheduling. In this paper, a mathematical model was built to investigate the impact of packet arrival rate and the utilization of MU-MIMO technology on the end-to-end delay distribution function along a path. Our findings indicate that the end-to-end delay does not always depend directly on the length of the path, but rather on the packet arrival rate. Furthermore, the analysis reveals that the implementation of MU-MIMO can significantly reduce end-to-end delay.