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I think the mechanism of time travel is much less interesting than its ramifications. I'm willing to let an author wave their hands about the mechanism, if the conflict that it sets up is worth it.
See, in particular, 1973 novel The Man who Folded Himself by David Gerrold. Brilliant and seminal time-travel fic. At one point he throws a month-long party in his apartment for all of himselves from different times. Crazy. So crazy, in fact, that I didn't just give away the craziest part!
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