Raw FootageItem larger than 3 hrs; Insert SetPoints to layers, organize layers in composition

i'm new after effects scripting easy on me. 

 

i have footage item greater 3 hrs (ae has limitation on layer length).  need write script take timestamp user input.  script take timestamp , trim out 'n' second window (probably 60 sec or less) before , after , set layer.  consecutavely , combine layers in order replay.  footage lapse video , have marry timestamp events come source.

 

these steps trying do.

1. take in user input timestamp (figured out.)

2. set footage item 'set in point' , 'set out point' based on 'n' seconds calculation.

3. insert trimmed footage item composition layer.

4. set layer start time. (figured out)

5. repeat 1-4 several times.

 

at end if repeated 5 times n = 30 seconds, 5 x 30 second consecutive shots combined make single composition 2m:30sec.

 

my application requires me consistently put in series of 5 timestamps , generate video same raw footage item. 

 

if there better way trim small section of huge footage item composition i'm ears.  please include examples.

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