In December 2016, the Cabinet Bureau of Personnel Affairs published a survey of how ministries prepare for questions in the Diet. The notices of questions from all members were complete, on average across ministries, at 8:56 in the evening. The latest came at midnight.
The divisions responsible for each answer were fixed on average at 10:36 at night, in the latest case at 4:50 in the morning. Each ministry received about 51 questions a day. In October, 476 officials were on duty on the night before a committee session, against 221 on an ordinary night.