node.js – 如何使expressjs中的会话不会过期

app.configure(function(){
//views
app.set('views',__dirname + '/views');
app.set('view ENGIne','ejs');
//parse request bodies
app.use(express.bodyParser());
app.use(express.methodOverride());
// session support
app.use(express.cookieParser(cfg.cookie_secret));
app.use(express.session({
  key : 'whynode',store : sessionStore,cookie: { 
    expires: new Date(Date.Now() + 60 * 10000),maxAge: 60*10000
  }
}));
app.use(passport.initialize());
app.use(passport.session());
//pass user data
app.use(function(req,res,next) {
  res.locals.req_path = req.path;
  res.localS.User = req.user || false;
  next();
});
//get routers
app.use(app.router);
//serve asset files
app.use('/assets',express.static(__dirname + '/public'));
});

我使用redis进行会话存储.完整的app.js代码可以在这里查看full app.js
 我现在遇到的是当我将应用程序闲置几分钟,会话到期时我需要再次登录.我们如何使会话在至少2-3小时不活动时不会超时？