how to change the time of slides ...

Hello,
I am preparing a slideshow and but I would like to use iMovie and then burn the finished product using iDVD. I have 420 slides in an iPhoto album, and I would like them each to be 7 seconds long. When I import them from iPhoto, they seem to be set at 1 second each? I can change them individually, but there must be a way to select them and change them all at once. There is probably a way to set transitions in bulk like this too? Any suggestions would be appreciated.

Lincoln

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