Initial setup for proving that Alfresco would do what we wanted took about 36 hours, as I had to learn enough about it to demonstrate it.
Demonstration of abilities took about an hour.
Our initial deployment of users have been using it for 100 hours+ now, and we're getting a good feel for it. Internal training is starting this week, with the idea that we'll be doing a 45 minute overview session to introduce people to it. Ongoing support of the initial deployment has been roughly one question every 3 or 4 days, some of which have necessitated research, others have been answered by the user asking the question after they played a bit more.