2016-09-28 13:47:12 +0200 answered a question Calculate total duration of an impress presentation In the content.xml that is inside the .odp (you can use unzip to extract it) there is a tag telling the duration of slides for each style. In the following example it is 876 (with PT before and S after):  If your presentation have only one slide style, you can probably make a simple script to get that number and multiply by the number of slides (i think it is the number of times the string `