Add info that would help to determine how long an initial scan would take

One of the common questions on FE forums is "how long my scan should/will take". See for example http://forums.atlassian.com/thread.jspa?messageID=257281154

I'd imagine that putting some common scenarios with some estimates would help people to know how much they should wait for the initial scan.

Just an idea, decide if there's a point in doing something like that.