one-hour drawing challenge
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The Late Night Serious 60-Minute Drawing Game (深夜の真剣お絵描き60分一本勝負, Shin'ya no Shinken Oekaki 60-bu Ipponshōbu), or 1draw (ワンドロ, Wandoro), is a self-explanatory Twitter hashtag where artists are given a prompt and have an hour to exercise their skills.
The prompt is usually composed of three characters from a set copyright. Each copyright gets their own tag.
The challenge was originally started on May 13, 2013, by twitter user monyomoke, establishing a prompt where participants were to draw Touhou characters Koishi, Nazrin, and/or Kasen. After a couple months, however, the organizer decided to quit, since he was tired. The role of organizer has since been passed over a couple of times.
The Touhou prompt is currently being hosted by @1draw_night. They also have a website which hosts the artworks posted at the hashtag, with the artists' permission.
Other accounts dealing with different copyrights have been appearing. Some tags may be defunct.