Translation guide
The English phrase "at length" has two main uses: describing something done in great detail or for a long time, and describing something that happens after a long time. This guide covers natural Japanese equivalents for each meaning.
To describe speaking, writing, or discussing something thoroughly, extensively, or for a long duration.
Adverbial form meaning 'in detail'. Very common and natural for describing detailed explanations or discussions.
To indicate that something happens after a considerable delay or at the end of a long period.
Adverb meaning 'finally' or 'at last'. Implies that something has been awaited or took a long time to happen.
Do not translate "at length" literally as 長さで (nagasa de) or 長さに (nagasa ni). These would mean 'in terms of length' (physical measurement) and are not used for the idiomatic meanings.
彼はその問題について詳しく話した。
He talked about the issue at length.
Adverb meaning 'at great length' or 'long-windedly'. Often carries a nuance of being overly long or tedious.
He spoke at length about his success.
Adverb meaning 'carefully' or 'thoroughly', implying taking one's time. Suitable for discussing something in depth without rushing.
We discussed the plan at length.
Adverb meaning 'minutely' or 'in great detail'. More formal and emphasizes exhaustive detail.
The incident was described at length in the report.
After a long discussion, a conclusion was reached at length.
Adverb meaning 'finally' or 'in the end'. Often used when something happens after a long struggle or wait.
He at length told the truth.
Phrase meaning 'over a long period of time'. Emphasizes the duration itself rather than the finality.
He mastered the skill at length.