'typical-length' originates from the combination of 'typical' and 'length', where 'typical' means 'usual' and 'length' refers to the measurement of something from end to end.

The term 'typical-length' combines the words 'typical' and 'length', which have been used in English since the 16th century.

Initially, it meant 'usual measurement', and this meaning has largely remained the same in modern usage.