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How big of a deal is it to be stuck in space? Do they have enough food and oxygen?
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They're on the ISS. They could stay there indefinitely. Since other spacecraft resupply the ISS too, the limiting factor is simply medical: long duration zero-G is bad for the body. But they could easily stay there a year or even two.
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Yes, other than the bones deteriorating. Space X will bring them down.
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