"equal length" is correct and usable in written English.
You can use it to describe two or more things that have the same length. For example: The two branches of the tree were of equal length.
Normally, the interval between beats is of equal length.
The state has distinct seasons of about equal length.
It looked obvious to keep four hearts, retaining equal length with the dummy, and to throw a diamond, keeping equal length with declarer.
Having equal length day and night shifts will make it administratively easier to achieve.
First, East should have remembered to keep equal length with the dummy.
The subtlety of the interviews – all given equal length and emphasis – belongs to Deller.
Keep equal length with the dummy and declarer except when it is wrong.
An article on the front page of a newspaper receives more attention than one of equal length inside.
Such melodies are analogous to poetry written in symmetrical verses with lines of equal length and repeated phrases.
Given who is writing the letters, it all has to be replied to, often at almost equal length.
Later the son in the family went back to London with him and stayed an equal length of time.
