Hey there @hpoonis2010,
Apologies for the delay.
It's my understanding that the timer / reset is used as the trigger point at which rewards are issues to the relevant players.
We have no further information beyond this as to the exact reasoning behind this element of the system however.
There's some more information the Shepherd Rank System in general here.
As the discussion in this thread has trailed off somewhat, I'll be locking it from here, but please feel free to create another and get back in touch if you have any further questions.