[Zope] Costs of implementation

I am trying to motivate the use of Zope / Zcommerce, and to do this need some timing ideas - Does anyone have thoughts on how long (man hours per expertise) it took them to go from no Zope to (Zope + Steve Spickelmire and Co's EMarket) and to a successful transaction? Hopefully this will be of general interest for anyone doing a business case or planning, so if you have any thoughts on "we expected x by experienced y" it should make interesting reading. Regards Dirk