what's the namespace lifetime multipler for this epoch?

def get_epoch_namespace_lifetime_multiplier( block_height, namespace_id ):
    """
    what's the namespace lifetime multipler for this epoch?
    """
    epoch_config = get_epoch_config( block_height )
    if epoch_config['namespaces'].has_key(namespace_id):
        return epoch_config['namespaces'][namespace_id]['NAMESPACE_LIFETIME_MULTIPLIER']
    else:
        return epoch_config['namespaces']['*']['NAMESPACE_LIFETIME_MULTIPLIER']