Hi Linda B,
Generally, transitions between slides take half their duration from the preceding slide and half from the slide after.
Hence two 10 sec slides with no transitions play for 20 secs.
One 10 sec slide, with a 2 sec transition after, plays for 10 secs
However, add two 10 secs slides and a 2 sec transition in between and the play length is 18 secs - so if you need to produce a slideshow of a particular length, you need to do some calculations.
Easy enough if all slides are equal and all transitions are equal but more complex if they are all different.
You must allow for slides with no preceding or following transition ie the first and last ones for example.
Hope that helps
Cheers
Adrian
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