A type of fandom event / art game that lasts for a certain number of hours, traditionally 24, but sometimes longer. An artist is assigned to each hour, and must post a piece of artwork for that hour. These events are common in Chinese fandom spaces and are usually themed around a specific copyright, character or pairing.

The day often correlates to a holiday or a character birthday.

See also

• One-hour drawing challenge
• Art relay

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