length
noun
1 some of these amphibians grew to a length of three or four metres | from the plane she was able to see the whole length of the valley:
extent, extent lengthwise, distance, distance lengthwise, linear measure, span, reach;
area, expanse, stretch, range, scope.
2 there has been a tremendous increase in the length of time spent on remand:
period, duration, stretch, term, span.
4 MPs criticized the length of the speech:
protractedness, lengthiness, extent, extensiveness, elongation;
prolixity, prolixness, wordiness, verbosity, verboseness, long-windedness.
▷antonyms conciseness, brevity.
□ at length
1 he spoke at length of his suitability for the job:
□ go to any lengths (also go to any length) for a long time, for ages, for hours, on and on, interminably, endlessly, incessantly, ceaselessly, constantly, continually, unendingly, eternally, forever.
▷antonyms briefly.
length Oxford Dictionary of English