Thanks for the response.
I had actually figured out what you are suggesting through the help documents.
But my problem is I have over 1100 JPG files. I am not going to click and drag 1100+ files to make them from .052 secs to .054.
For the same reason, I really could not use the "Resize Sources" you mentioned.
The only way I have figured out how to do this is to change the default duration, load certain jpg files for that duration length, then change the default, load those jpgs, then change the default, load those jpgs, ...
This is very tedious, but seems to work.