eout: timeout for downloading each individual archive when
  the connection becomes idle, no timeout applied if **None**
:param int retries: maximum attempts to impose on a per-archive basis

:returns: **iterator** of
  :class:`~stem.descriptor.tordnsel.TorDNSEL
  for the given time range

:raises: :class:`~stem.DownloadFailed` if the download fails
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