And they will not have been in a bed or have had a shower in almost a week!
Does this sentence say that there will be a period of time in the future, and it will last a week, when they are not going to have a shower or be in a bed? Or it says about the past, and the verb
willhere is a modal of some kind expressing volition?
No, it doesn’t mean that. It means that at some future time the description will apply. Nothing complex.
That future time might be in two days, and they might not have slept or showered for three or four days already. Or it might not be until years from now – for a long time yet, they’ll just carry on as normal.
Note that in practice, native speakers would almost always say “And they won’t have been…”
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