Well v_e, assuming for the sake of discussion a diety exists, as otherwise it's pointless discussing it's benevolence or otherwise; it would create a universe that can run itself, as otherwise we'd see loads of tweaks occurring as they fiddled with stuff to get a better result. A deity is therefore constrained by that self imposed limit, regarding what can be done. It would create the best (most benevolent ?) system possible within that constraint. This means any creature needs an incetive for, as an example, not running on a broken leg, or taking rest and recuperation when ill. Thus pain. Since being recoverably ill and fatally ill are not going to be distinguishable to the body, pain is inevitability involved in some deaths. Thus it must exist whether the diety is benevolent or not.
As for a period being shorter than "life everlasting", a truism surely.