PERMANENT_SESSION_LIFETIME can now be an integer. This fixes #310

docs/api.rst

@@ -217,6 +217,13 @@ implementation that Flask is using.
 .. autoclass:: SessionMixin
    :members:
 
+.. admonition:: Notice
+
+   The ``PERMANENT_SESSION_LIFETIME`` config key can also be an integer
+   starting with Flask 0.8.  Either catch this down yourself or use
+   the :attr:`~flask.Flask.permanent_session_lifetime` attribute on the
+   app which converts the result to an integer automatically.
+
 
 Test Client
 -----------

docs/config.rst

@@ -86,6 +86,8 @@ The following configuration values are used internally by Flask:
                                   `False`.
 ``PERMANENT_SESSION_LIFETIME``    the lifetime of a permanent session as
                                   :class:`datetime.timedelta` object.
+                                  Starting with Flask 0.8 this can also be
+                                  an integer representing seconds.
 ``USE_X_SENDFILE``                enable/disable x-sendfile
 ``LOGGER_NAME``                   the name of the logger
 ``SERVER_NAME``                   the name and port number of the server.