There is no regulation length or diameter. They can be as short as a metre or less, or longer than two metres.
Most commonly they would be a little less than two metres.
The Australian Aboriginies
The didgeridoo is an Australian aborigine's musical wind instrument.
The word is spelled didgeridoo. A didgeridoo is an Australian wind instrument developed by the native Australian tribes over 1500 years ago.
The Aboriganal Australian instrument is called the didgeridoo.
The didgeridoo has been used by Australian Aboriginals and similar instruments by others since ancient times. It is not known who invented it.
Didgeridoo
A yidaki is an Australian aboriginal name for the didgeridoo, from the Yolngu word for the instrument.
The didgeridoo was invented in 1500 by the aborigines
The didgeridoo is an indigenous Australian instruments that is not formally categorised with any other family of instruments. At best, it would be considered to belong to the wind family.
The Australian aborigines created the didgeridoo.
Sounds in an indigenous Australian dance would include the didgeridoo, click-sticks and aboriginal chanting.
The didgeridoo is sometimes played as a solo instrument for recreational purposes, though more usually it accompanies dancing and singing in ceremonial rituals. For Aboriginal groups of northern Australia, the didgeridoo is an integral part of ceremonial life, as it accompanies singers and dancers in religious rituals. Source: http://en.wikipedia.org/wiki/Didgeridoo