Warrick,
> but is there any way
> of getting a duration (either total or per slide) thru this interface?
No.
> If not, is there any other way to programmatically get the duration of a
> given PPT/PPS slideshow without having to have PowerPoint installed?
No. You need PPT to achieve this.

Signature
Regards
Shyam Pillai
Handout Wizard: http://www.mvps.org/skp/how/
>I stumbled across the DSOFILE.dll today, and have been playing with it a
> bit, learning what I can and cannot get.
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> If not, is there any other way to programmatically get the duration of a
> given PPT/PPS slideshow without having to have PowerPoint installed?