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Dark matter charged under a new gauge sector, as motivated by recent data,suggests a rich GeV-scale "dark sector" weakly coupled to the Standard Model bygauge kinetic mixing. The new gauge bosons can decay to Standard Model leptons,but this mode is suppressed if decays into lighter dark sector particles arekinematically allowed. These particles in turn typically have macroscopic decaylifetimes that are constrained by two classes of experiments, which we discuss.Lifetimes of 10 cm < c tau < 10^8 cm are constrained by existing terrestrialbeam-dump experiments. If, in addition, dark matter captured in the Sun (orEarth) annihilates into these particles, lifetimes up to 10^15 cm areconstrained by solar observations. These bounds span fourteen orders ofmagnitude in lifetime, but they are not exhaustive. Accordingly, we identifypromising new directions for experiments including searches for displaceddi-muons in B-factories, studies at high-energy and -intensity proton beamdumps, precision gamma-ray and electronic measurements of the Sun, andmilli-charge searches re-analyzed in this new context.

Terrestrial and Solar Limits on Long-Lived Particles in a Dark Sector