@shopify/polaris-tokens/dist/duration.map.scss

$polaris-duration-map: (
  'duration-none': (
    0,
  ),
  'duration-fast': (
    100ms,
  ),
  'duration-base': (
    200ms,
  ),
  'duration-slow': (
    300ms,
  ),
  'duration-slower': (
    400ms,
  ),
  'duration-slowest': (
    500ms,
  ),
);