Which company holds the Guinness World Record for 'Most Loyal Customer Base' as measured by average customer retention duration?

In the competitive world of retail and customer experience, companies constantly strive to break records for customer loyalty and retention. Some brands have achieved truly remarkable milestones in building customer relationships that have earned them spots in record books. Test your knowledge about extraordinary customer loyalty achievements that have made history!

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American Express (average customer tenure of 14.3 years)
USAA Insurance (average customer tenure of 18.7 years)
Apple (average customer tenure of 12.9 years)
Harley-Davidson (average customer tenure of 16.2 years)