Well ,it would depend on how close you are to the exchange( I stand to be corrected here)...I would think that you should reach maximum speed of 600kbps+ on a business account...according to afrihost there is no shaping on business accounts at all be it business hours and off peak hours...just my thoughts, I stand to be corrected, someone more tech savvy will provide you with the correct information though...
From my understanding, you could have a 10mbps line but the data package you acquire will determine what speed you will get, meaning 10mbps line + 6mbps package should only reach speeds of 600kbps-650kbps...10mbps line+10mbps package would reach speeds of 1000kbps+...
I hope someone can validate this for me, I hate to be spreading false information to people who want advice...thanks