When a PDF is uploaded to the CMS, the default duration of the PDF regardless of pages is 7 seconds.
You may modify the duration of a PDF and its pages by entering a duration eg: 30 seconds.
Each page will be automatically equal in playback based on the duration you have entered.
eg; If you have 4 pages in a PDF and the duration is set to 30 seconds
Each page will play for 7.5 seconds each.
40 seconds and each page will play for 10 seconds each.