Thematically, a week isn't long enough for the boys to realize what life is like without the other. Nor does a week seem like enough time for Lucifer to find Sam or for Zachariah to turn to radicals to track down Dean. As for Cass not contacting Dean for three months... I think it's believable because Cass was off looking for God. Knowing that Cass's sense of the passage of time is a bit off, I can see it being three months before he contacts Dean.
A week could work, but three months *feels* better.
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Thematically, a week isn't long enough for the boys to realize what life is like without the other. Nor does a week seem like enough time for Lucifer to find Sam or for Zachariah to turn to radicals to track down Dean. As for Cass not contacting Dean for three months... I think it's believable because Cass was off looking for God. Knowing that Cass's sense of the passage of time is a bit off, I can see it being three months before he contacts Dean.
A week could work, but three months *feels* better.