I've said it before and I'll say it again - if what you have in your game world works for you, then it is right. In my own campaign my players are more concerned about staying alive, salvaging weapons and equipment, making/acquiring fuel etc to worry about the big picture, so I can mess around with timelines etc as much as I like.
Of course trying not to get munched by zombies is taking a fair bit of their attention as well.....
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