Ethereal-users: [Ethereal-users] what does "Time" mean

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Date: Mon, 28 Jun 2004 22:43:50 +0900 (JST)
Hello,

I have a very basic question.
There is the colum of Time on Ethereal.
I'd like to know what "Time" mean.
What is Time=0.0000?
Is the unit [sec]? or any other special unit?

ex. I got the following log. In this case, does this mean that the packet was 
sent 0.470679sec after capturing start?

No.     Time        Source                Destination           Protocol Info
      2 0.470679    192.168.128.1         224.0.0.9             RIPv2    Respo
nse

Thank you in advance.
Takeo Nasu