old_contents: # Default cache duration
  CACHE_RELATION_DEFAULT_DURATION = 60 * 60 * 24 * 3
  
new_contents: from django.conf import settings
  
  # Default cache timeout
  CACHE_RELATION_DEFAULT_DURATION = getattr(
      settings,
      'CACHE_RELATION_DEFAULT_DURATION',
      60 * 60 * 24 * 3,
  )
  
subject: Allow global settings to override.