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