Bpplschedwin and incremental backup

Hello Community ^^,

I have done a script to change a Schedule of Many Policy who have approximatively the same Name.

This part is ok, i'm using at the end, the command line .\bpplschedwin.

With a Schedule for a Full backup it's easy to do and understand, but for an Incremental Backup, I don't know if we can use this command for ?

For example, my config file of Schedule is : 

SCHED Incr 1 1 604800 1 0 0 0 *NULL* 0 0 0 0 0 0 -1 0 0
SCHEDWIN 0 0 68400 39600 68400 39600 68400 39600 68400 39600 68400 39600 0 0
SCHEDRES *NULL* *NULL* *NULL* *NULL* *NULL* *NULL* *NULL* *NULL* *NULL* *NULL*
SCHEDPOOL *NULL* *NULL* *NULL* *NULL* *NULL* *NULL* *NULL* *NULL* *NULL* *NULL*
SCHEDRL 1 1 1 1 1 1 1 1 1 1
SCHEDFOE 0 0 0 0 0 0 0 0 0 0
SCHEDSG *NULL* *NULL* *NULL* *NULL* *NULL* *NULL* *NULL* *NULL* *NULL* *NULL*

So the Backup begin the Monday and end the Friday.

But 68400 s / 3600 = 19 so 19h after Midnight ?? and the other numer is 39600 /3600 = 11....? 

If i look with the console NetBackup my backup begin the Monday at 00:00 to 06:00 and 19:00 to 00:00

Please explain to me how it's work for i continue my script.

Thx a lot  ;)