Few things, while time is like the other three dimensions, and it is helpful to think of it that way, I'm not entirely sure that it is, in fact, the same as the others.
Also, I'm not quite sure what you're asking. Something with an infinite fourth dimension would simply exist everywhen, just as something with infinite width, length or height would be located everywhere on a certain plane that was coincident with that dimension.
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Originally Posted by Lysis
Dimensions are just ideas, really. "Time" isn't actually a dimension in the traditional geometrical sense, as the only three dimensions geometrically are "length" "height" and "width."
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Mostly right, you can add other dimensions, and up to twelve may actually exist.
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Time is also just an idea, a measurement, rather than something physical.
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There I may have to disagree with you. Time exists. We can measure it (given the relationship between speed, distance and time; or other relationships.) but the measurement, in and of itself, is not time.