Mobile Ad hoc Networks (MANET) are self configuring, transportation less, dynamic wireless networks in which the nodes are resource constrained. Intrusion Detection Systems (IDS) are used in MANETs to monitor actions so as to detect any intrusion in the otherwise vulnerable network. In this paper, we present efficient schemes for analyzing and optimizing the time length for which the intrusion detection systems require to remain active in a mobile ad hoc network. A probabilistic model is proposed that makes use of help between IDSs among neighbourhood nodes to reduce their unit active time. Usually, an IDS has to run all the time on every join to oversee the network behaviour.

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