  The fact that AdS black hole interior geometries are time-dependent presents
two challenges: first, to holographic duality (the boundary matter tends to
equilibrate, often very quickly), and, second, to the idea that wormholes can
be traversable (the wormhole geometry is dynamic, and the wormhole is apt to
collapse too quickly for traversal to be possible). As is well known, the first
puzzle can be addressed by considering the quantum circuit complexity of the
strongly coupled boundary matter, which can continue to grow long after
equilibrium is established. We show that data from a phenomenological model of
the Quark-Gluon Plasma indicate the existence of an upper bound on the rate of
increase of the (specific) complexity, in agreement with a simple holographic
model. We then point out that, in this model, this upper bound becomes stricter
if angular momentum is added to the bulk black hole while fixing the
temperature (at any value, so the black hole is \emph{not} near-extremal). We
show that the dual phenomenon, a dramatic slowing of the black hole interior
dynamics at high specific angular momentum, also occurs. We conjecture that
sufficiently slow complexification of the field theories dual to rotating black
holes is associated with traversability of the bulk wormhole, when quantum
effects are taken into account.
