With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvpdnTunnelSessionCallDuration
cvpdn Tunnel Session Call Duration
1.3.6.1.4.1.9.10.24.1.3.1.1.4
This object specifies the call duration of the current active user session in value of system uptime.
Back to CISCO-VPDN-MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor cvpdnTunnelSessionCallDuration on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.