You can also check out my free 8 part Basic Training tutorials.
My complete course at lynda.com.
And my book, available on Amazon.com, which covers how to use pretty much every tool in the program.
Since your question is specific to Time Lapse video in Premiere Elements 11, I will customize my response to that. But, I would ask "What computer operating system is your Premiere Elements running on?"
I am not clear on what you are trying to achieve with in and out points for Time Lapse and what you are doing with the frame duration for each of the files in the Time Lapse.
Please review my blog post on Time Lapse Basics and then we will move forward to compare details.
There is an alternative approach that is not my first choice, but may be of interest.
Looking forward to your follow up.
For Trimming of Video using Preview Windows with its Set In and Set Out points, the following may be of interest