How do I get number of Working days and hours that setting in timeTrackingAdmin!default.jspa screen

I’m newbie.
I’m have problem when using java code to get number of wokings days, hours.
When i setting time tracking, like above image:
1 week = 5 days,
1 day = 8 hours.
When i change
1 week = 4 days,
1 day = 4 hours.

So, How do I get value when i change.

Please help me