  Upgrades at the Belle II experiment and the SuperKEKB asymmetric-energy
electron-positron collider enable precise measurements of particle decays. Even
with early data, Belle II has made several world-leading measurements of
particle lifetimes, which are useful as tests of effective models used in
searches for physics beyond the standard model. Especially for charm hadrons,
these effective models depend on careful consideration of non-perturbative
effects to give an adequate description of lifetimes. Recent measurements at
other experiments have stimulated particular interest in charm baryons,
including several measurements that indicate the hierarchy of lifetimes is
different than once believed. The measurements of the $D^+$, $D^0$, and
$\Lambda_c^+$ lifetimes at Belle II are consistent with previous measurements,
but with improved precision. These measurements will improve the world-average
values, provide refined tests for effective models, and serve as benchmarks for
future measurements.
