What preparations do I need to make in the space before the installation team arrives, and how long should I expect the installation process to take?

Warning (512): Missing plural form translation for "%d hour" in "default" domain, "ara" locale.  Check your po file for correct plurals and valid Plural-Forms header. [APP/Lib/I18n/I18n.php, line 276]
Code Context
                                $_this->_lang
                            ),
                            E_USER_WARNING
I18n::translate() - APP/Lib/I18n/I18n.php, line 276
__n - CORE/Cake/basics.php, line 613
AppTimeHelper::timeUtility() - APP/View/Helper/AppTimeHelper.php, line 225
AppTimeHelper::timeAgoInWords() - APP/View/Helper/AppTimeHelper.php, line 51
MooHelper::getTime() - APP/View/Helper/MooHelper.php, line 291
include - APP/Plugin/Question/View/Questions/view.ctp, line 165
View::_evaluate() - CORE/Cake/View/View.php, line 971
View::_render() - CORE/Cake/View/View.php, line 933
View::render() - CORE/Cake/View/View.php, line 473
MooView::render() - APP/View/MooView.php, line 807
Controller::render() - CORE/Cake/Controller/Controller.php, line 973
AppController::render() - APP/Controller/AppController.php, line 1153
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 200
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 167
[main] - APP/webroot/index.php, line 80