It depends if the F4 are online and how busy they are. ファンポップ has millions of users and millions of clubs. They get a lot of reports each day, which they patiently go over, investigate and decide against. It will take time, all we can do is hope they realise how serious this is によって how many reports this gets. It will make their job a lot easier, if instead of reporting the posts, あなた レポート the user instead :)
