What version of Premiere Elements and on what computer operating system is it running?
In the absence of that information, I will generalize assuming that you are in the Expert workspace (Premiere Elements 11, 12, or 13) or the Timeline workspace (Premiere Elements 10 or earlier)
If you are talking about the duration of each still in the Premiere Elements Editor
a. Before you import the stills, open Premiere Elements Editor Edit Menu/Preferences/ General and set the Still Image Default duration there.
Then add the stills to the project.
b. If you have already imported the still with the 5 seconds Still Image Duration, right click the still on the Timeline, select Time Stretch and set
the duration in the Time Stretch dialog for the wanted duration.
So lots of information for you to supply so that we can fine tune the reply for what you are seeking. Also, indicate if you want to change the duration
for more than 1 still at a time. And, if you are in the Elements Organizer Slideshow Editor and not the Premiere Elements Editor, please let us know.
Premiere Elements 13; MS windows 7 with all updates;
Thanks for the additional information for your question.
Premiere Elements 13 on Windows 7 (assumed 64 bit)
Premiere Elements 13 Editor
Expert workspace and Quick workspace
Before you import the stills, open Premiere Elements Editor Edit Menu/Preferences/ General and set the Still Image Default duration there.
Then add the stills to the project using the programs Add Media/. You will note that Still Image Default duration uses the units of Frames.
In a setup using 29.97/30 frames per second: 150 Frames = 5 seconds; 75 Frames = 2.5 seconds; 300 Frames = 10 seconds.
Once you make the set, it stays that way different project to different project until you change it. Once this setting is made, all stills imported
into the project after the set, will have the duration that you set.
Right click the still, select Time Stretch from the pop up menu/ and, in the Time Stretch dialog, set the duration for what you want -
if 5 seconds, then 00;00;05;00; if 2.5 seconds, then 00;00;02;15; if 10 seconds, then 00;00;10;00. If you want to change the duration
of more than one still at a time, select all, and then do the Time Stretch dialog's duration setting.
To make the all at one time selection -
if the stills are scattered on the Timeline, then hold down the Ctrl key of the computer main keyboard as you click on each of the stills
to be involved....
if the still are sort of in a block, then with the mouse cursor draw a rectangle around them to select them all at one time
if all you have on the TImeline are the stills and you want to change the duration of them, then Edit Menu/Select All or Ctrl+A to select
them all at one time.
Please review the above and let us know if it works for you.