Client.login({ "username": "gm1999", "password": "WACHTWOORD" }, function (error, data) {

    for(var i = 1; i < 50; i++){
        Userlist.getPage(i, function(error, data){

            data.forEach(function(v, k){

                v.getData(function(error, data){

                    console.log(data.name + ": " + data.lastOnline);
                });
            });
        });
    }
});