Thanks Peru Bob!
I just saw your thread and wondered if you had all the information that you sought.
You talked about
How do I alter the default length (in seconds) of stills imported into Adobe Elements 11?
and not necessarily how to change the duration of one particular still. Are you working with a Time Lapse project where you need details
on changing the duration of more than one still at a time?
We will post more details on Time Lapse video basics for Premiere Elements if needed as well as considerations for changing clip duration in preferences before import and with Time Stretch after import..
The link provided by Peru Bob gave me the info I needed, thank-you. It was a lot of photographs that I was importing.