I'm not sure, but this sounds like an example of Begging the Question. I'm probably forgetting how this thread is progressing. When a days or even years are mentioned, they can be figuratively referring to less than complete days or nights, but when nights are mentioned in addition to days, those nights are included. In other words, we're not dealing with figurative speech when nights and days are mentioned.kamaeq,
So what examples are you using to say that it was common to forecast or say that a daytime or a night time would be involved with an event when no part of a daytime or no part of night time could occur?
On the other hand, to say "three days" or "three years" doesn't necessarily mean we are figuratively speaking about less than three whole days or years. When the literal days and nights are mentioned we know that the other accounts are not figurative.