Advance slides automatically

  1. Select all your slides (CTRL+A)
  2. Go to the "Advance Slide" (=top right of your TRANSITIONS tab) ...
  1. uncheck the box for "On Mouse Click"
  2. check the box for "After" (first this will set all the slides to 0 sec. to start)
  3. now increase the amount of time to 10 sec.

Now all your slides should be set to 10 sec.

Click off the slides, select just the first one and change it to "5". When you [Enter], it'll change the first one to be only 5 seconds.