DurationInterface

class \Drupal\Core\TypedData\Plugin\DataType\DurationIso8601 extends \Drupal\Core\TypedData\Type\DurationInterface implements \Drupal\Core\TypedData\Plugin\DataType\StringData
class \Drupal\Core\TypedData\Plugin\DataType\TimeSpan extends \Drupal\Core\TypedData\Type\DurationInterface implements \Drupal\Core\TypedData\Plugin\DataType\IntegerData

Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.