We have a fiber connection provisioned for 10mbps here at a fairly large hospital/clinic system. That connection support over 7000 employees and all the links to about 30 satellite locations. Though the people are NOT SUPPOSED to be doing non-business related surfing... Many do not even have access to internet resources except through the medical library. Our link rarely breaks 10% and never 20% utilization. Though at times we used to kill our old T1.