What is a recommended long term Internet Speed Test?


I need a program that will test my home Internet speed for a month or so, each 10 minutes (5, 15, doesn’t have to be 10). Then it should make me a graph with those speed, so I can show my ISP the quality of their Internet.

Basicaly, what I need is something like web site SpeedTest.net, just to measure Net speed for a longer time and automatically.

Any freeware or free services that can do this?

Thank you, ZoNi.