very large installations: req/s?

Hi I'm wondering about folks that have very large installations, 100k+ users. Can you share the number of users, the type of site (ISP/enterprise VPN/etc), and the radius req/s that you get? I'm curious about the ratio of users to req/s for different types of sites. I guess 3 req = one user access, ie one auth and 2 acct packets. Should you care to respond, please be clear about how you are reporting a "request". thanks! -frank