Build info time / statistics - for the inquiring mind

[David Timms]

Lets say you have a reasonably modern PC, 400G disk sata, 2GHz cpu, 1G 
ram. Can someone give me an idea of just how long doing a full package 
compile / build + iso images would take ? Plus how long for extras ?
How long would it take with the boxes that redhat use to do it?
(or is that competitive info that's not for release ?)
  Dave T.