The phrase "at more length" is correct and usable in written English.
It is typically used to indicate that something will be explained or discussed in greater detail.
Example: "The author will address the topic of climate change at more length in the following chapters."
Alternatives: "in greater detail" or "more extensively".
Now let me put this at more length.
We will discuss this problem at more length in a follow-up to this article.
I recently visited Cityfarm, a rooftop operation in Hong Kong, which I write about at more length here.
Except there's a serious intent – explained at more length in this article – with the app helping Nasa monitor the effects of clouds on the Earth's climate.
So much for the diatribe, but what would a solution be? Friedrich Engels discussed housing at more length, in 1872's The Housing Question.
Covered at more length earlier in the week, this is an advance promotion for the new album from Snoop Lion (formerly Dogg).
We listen first to the father, and then, at somewhat more length, to the mother, as in turn they address the dead daughter, and appeal to her for forgiveness while going over the failures of their marriage and separation.
This point is worth talking about at a little more length, because it is crucial to understanding this election.
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But, as I discuss at a bit more length in our Fiscal Monitor video, deficits are not declining enough to stop the rise in public debt: countries borrow less than in the past but they still borrow quite a lot and overall their debt is increasing, including in relation to GDP.
Clumping of colour intensity at one or more length scales is associated with a violation of translational invariance and high lacunarity values, while colour or texture homogeneity is equivalent to translational invariance and low lacunarity values.
