Maximum Number of Encrypted Tunnels
Up to 100 encrypted tunnel on a 1700, up to 300 tunnels on Cisco 2600, up to 800 for 2650, up to 800 tunnels for the Cisco 2600XMs, 2691, and 3725, up to 800 tunnels on Cisco 3620 and 3640, and up to 2,000 tunnels on Cisco 3660 and 3745.
This statistics is for the VPN module in a standard 1700/2600/3600 router