Swift said she will be discharged Sunday but that her twin girls, Lauren and Sarah, would remain in the hospital for another day or two.

CNN: Massachusetts governor to go home before twins

But for the most part the effect of the crisis on education seems to be confined to contingency planning, with councils saying that another day or two would bring more widespread problems.

BBC: Pupils to cycle to school in fuel crisis

Some U.S. officials, a step removed from the talks but often involved in discussions about them, said they do not rule out the idea of Clinton pushing for a partial agreement, or as one put it, "a framework of progress, " if another day or two passes without resolution.

CNN: Clinton

Sometimes, the raw index might leap from one plateau to another in only a day or two, but those disasters tend to be averted.

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