Look in maps\mp\gametypes\hq.gsc. There are lots of examples of how to do a loadbar.
And a loadbar is by definition how long it takes to finish. It seems pretty dumb to also have numbers. A loadbar is a graphical representation of numbers. It tells you how much time is left before its done. That would be like saying, "I want Windows desktop icons, but I also want numbers to tell me the position of the desktop icon". Just stupid.
DOH!