In this report, we present an estimation of the one-hop delay in 802.11 wireless network using the OLSR routing protocol. Our approach consists in modeling the 802.11 Mac sublayer while taking advantage of statistics obtained through the use of OLSR. We model each node as a discrete time M/G/1 queue. The Mac service time distribution is derived by modeling the exponential backoff function and deducing the collision probability and the channel occupancy from OLSR statistics. Our model is verified through simulations using the ns-2 tool.