How short was the shortest song performed in the Eurovision Song Contest?

Explanation

A song in the ESC cannot be longer than 3 minutes. In 1957, the limit was set at 3.5 minutes, and in 1962, this was shortened to 3 minutes. The songs have to be performed live and cannot have been publicised or performed earlier than a certain date a few months ahead of the ESC. The shortest song in the ESC history lasted only 1 minute and 50 seconds, and was performed by Great Britain in 1957.