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originally posted by: Zaphod58
a reply to: buddah6
With 44+ hour missions becoming a reality now, then unmanned is the way to go for those. It's too much stress to put on the crews, even if they swap crews they're flying for 20+ hours, and in the case of the B-2 crews, with nothing but a chaise lounge to grab a nap on, an hour at a time.