Retention Policies question

Hello,

i am Sandro from Starnberg (Germany).
Can anyone explain me what happens when more retention times are set?
An Example:

In a Media Pool are set 30Day

In a Group (Member of  the Media Pool above) are set 5 Month

on a Client (Member of the Group above) i start a savefs command with a retention time of 15 Months

What will count now?
Will the savefs overwrite the configuration of the MP for this Client?