Standard Bandwidth for SAPGUI

Hi

I´ve read in documents that the standard bandwidth for SAP GUI is 56Kb per user , but talking to other people that are currently using SAP I can see that much of them are not using 56Kb but less,  for example 16Kb.

I want to ask you guys in forum , what are your experiences about the required bandwidth for SAP GUI?

We are going to use ECC, CRM, SRM, BW, BI.

Thank you

Sergio