Longest lasting rainbow observation

According to Official Guinness Records,

The longest lasting rainbow observation is 8 hours and 58 minutes and was achieved by Chinese Culture University (Chinese Taipei) at Yangmingshan, Taipei, Chinese Taipei, on 30 November 2017.

For a complete list of 2017 records, please visit 2017 Guinness Records in Taiwan.

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Other Taiwan records that might interest you:

• Heaviest weightlifting 58 kg clean &jerk (female)
• Largest display of Taoist statues
• Longest wedding veil
• Highest temperature in a wood-fired kiln
• Largest parade of motorised tricycles/trikes