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We consider some aspects of the Transplanckian Censorship Conjecture, whichstates that for theories of quantum gravity which yield a quintessenceuniverse, there is a limit on the lifetime of the state not too different thanthe current Hubble horizon. We consider some aspects of tunneling in thepresence of time-varying fields, and note that lifetimes can be parametericallyquite large. We consider what it might mean to find a quintessence potential instring theory, and argue that such states are likely to have very longlifetimes.

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