JB has a great post on methods, benefits and perils of getting those old CAD details into Revit.
If The office has 1,000 details (traveling West at 65 MPH) and Johnny manages a team of 5 users (and 3 of them play hockey) and each user draws 1 detail a day: When will they be in Chicago?...Uuummm I mean, when will they be finished?