With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciscoTcpConnElapsed
cisco Tcp Connection Elapsed
1.3.6.1.4.1.9.9.6.1.1.1.5
Amount of time this TCP connection has been established.
Back to CISCO-TCP-MIB MIB page.
IPHost Network monitor allows you to monitor ciscoTcpConnElapsed on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.