@property<EOL><INDENT>def deadline(self):<DEDENT>
return self.__deadline<EOL>
Timeout before ping exits.
You can specify either a number or a string (e.g. ``"1sec"``).
If both :py:attr:`~.deadline` and :py:attr:`~.count` are |None|,
If a number is specified, the unit will be considered as seconds.

    +------------+----------------------------------------------------------+
    |    Unit    |                Available specifiers (str)                |
    +============+==========================================================+
    |days        |``d``/``day``/``days``                                    |
    +------------+----------------------------------------------------------+
    |hours       |``h``/``hour``/``hours``                                  |
    +------------+----------------------------------------------------------+
    |minutes     |``m``/``min``/``mins``/``minute``/``minutes``             |
    +------------+----------------------------------------------------------+
    |seconds     |``s``/``sec``/``secs``/``second``/``seconds``             |
    +------------+----------------------------------------------------------+
    |milliseconds|``ms``/``msec``/``msecs``/``millisecond``/``milliseconds``|
    +------------+----------------------------------------------------------+
    |microseconds|``us``/``usec``/``usecs``/``microsecond``/``microseconds``|
    +------------+----------------------------------------------------------+

:py:attr:`~.deadline` automatically set to the default value (``3 seconds``).
Defaults to |None|.

Returns:
    humanreadable.Time: deadline