Webdispatcher Sizing - Interesting question

Hi ,

I have few queries on sizing the webdispatcher . I was actually refering to the sizing guide for web dispatcher in service.sap.com/sizing . It says that average size of a message is 16 KB .How do we measure the message size or in other words for portal connected with a webdispatcher having a 1000 users , how much messsage with be flowing back and forth ?

Any clue abt this

Aneez