These kinds of files are 3 sections: Start, Middle, and End
The RP plays them like this:
Short press: Start + End
Long Press: Start, Middle, End
Longer Press: Start, Middle + middle + middle etc., End
It plays each section in its entirety, so if the middle is a long recording, it will be a long sound no matter what.
Ideally horns should be recorded with as short a middle section as possible for the best response times.