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Re:The Long Chase by pavel_lishin on Saturday July 30, 2016 @11:51PM (#12195662)
I believe Larry Niven had one as well; I don't remember how long it lasted, due to relativistic effects.

The Ethics of Madness, I think it was called.

Re:The Long Chase by wiml on Sunday July 31, 2016 @06:59AM (#12196429)
I think it lasted indefinitely. Both people had life-extension technology on their ships and they were Bussard ramjets of the "can accelerate forever" variety.

Another classic relativistic story is Pohl's _Starburst_.