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Space-time refers to the relativity concept that time and space are related, such that traveling through space affects how you travel through time. Gravity doesn't actually exist, it's just that the mass of large bodies like planets distort space and time so that traveling past one in a straight line leads you around it's curve.
Or so it's explained in the Extra Credits episode on "technobable" and what those fancy sounding science words actually mean. (EC is a web-based video series found at Penny Arcade's website, in their PATV section. Check it out. )
So, for people who are using instellar spaceships, they'd be experiencing a lot of distorted time because of the speeds and distances trough which they travel space. If it werent for subspace, which in fact ALSO relates to time space in allowing them to cross lots of space in what seems like very little time.
Indeed, a jump may even seem like less time than it really is, as far as the rest of the universe is concerned.
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