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  • +1 @Doug B: Yes, I know, but it's not even possible to give a best, worst and average case estimate? Commented Mar 8, 2012 at 17:02
  • @blunders: You can, but as David alludes to those estimates will depend on the quality of the underlying data and metrics used to support the estimates. Garbage in = Garbage out. Commented Mar 8, 2012 at 18:11
  • Yes, it was never a question of if it's possible, and clearly any answer provided must be taken within the context that allowed it to be reached. I also believe it's possible there is an answer for the question without having to do the survey myself. Commented Mar 8, 2012 at 18:27