I finally found what I was looking for. There is a command "pausetime" that controls it. In the file c:\cumulus\webfiles\lib\jquery.nivo.slider.pack.js is the command "pauseTime:3000". I am not sure exactly how long 3000 is, but I changed to to "pauseTime:6000" so each graphic stays displayed for twice as long. I like this as when there is a graphic that a person wants to look at, and they don't realize hovering over the graphic will pause it, this will help.
Tom