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A span of time in the future equal to the current length of a relationship. For a relationship 6 months long, the Date-Time Continuum's event horizon lies 6 months in the future. Violating the Date-Time Continuum by making plans beyond the event horizon is ill-advised and stands to cause the relationship to explode in a dazzling supernova of animosity or collapse into a blackhole of mutual loathing.
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