Most pages in a periodical magazine

According to Official Guinness Records,

The bulkiest consumer magazine ever published was the 10 Jan 1990 issue of the weekly Shukan Jutaku Joho (Weekly Housing Information), running to 1,940 pages. Published in Japan by the Recruit Co. Ltd, it retailed for 350 yen.

For a complete list of 1990 records, please visit 1990 Guinness Records in Japan.

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Other Japan records that might interest you:

• Fastest hurdles 50 metres (male) (indoors)
• Best selling single by a Japanese act
• Most facings on a gatefold vinyl LP
• Largest bowling alley
• First atomic bomb used in battle