This was actually from a report by the Coalition for Secure and Trade-Efficient Borders, which was a coalition of about 50 businesses from both sides of the border that are studying the issue. Actually, their final report was in 2005, because they gave up on this issue, but the numbers within there were that prior to September 11, 2001, estimated processing times--and this, of course, varies depending on the shipment and other factors--averaged about 45 seconds, and that at this point as of 2004, which was when the latest data was available, the processing times had gone up to 2 minutes and 15 seconds.
On April 26th, 2007. See this statement in context.