The average length of these clips is about 33 seconds, and most are now (July 2008) about 3.5mb in size, with a resolution of 600 x 480 pixels. They're not DV quality, but actually pretty good.
The web server used for the TT99 videos is NOT a streaming server; therefore viewers will have to wait until enough of the movie has downloaded for them to play.
See this page for technical notes on how the movies were originally produced.
I am very grateful to all in the British Museum who helped make this project feasible.