The phrase "a lengthy work" is correct and usable in written English.
It can be used to describe a piece of writing, such as a book, article, or report, that is extensive in length.
Example: "The professor assigned a lengthy work on the history of art that took several weeks to complete."
Alternatives: "an extensive piece" or "a long document".
It can ill afford a lengthy work stoppage.
Verizon has taken elaborate preparations to weather a lengthy work stoppage, which would affect Washington, D.C., and 12 states from Maine to Virginia.
Elgar's Gerontius is a lengthy work suffused with the composer's Catholic faith, describing the itinerary of a soul towards final judgment.
She had a lengthy work experience being affiliated with Lincoln Hall in Lincolndale, New York, Family Court, N.Y.C., St. Vincents Hospital in N.Y.C. and in Harrison, N.Y., Mercy College, Dobbs Ferry.
Over the coming years of her term as makar, Kay will unveil the next stage of the tour every spring and autumn, writing a verse about each place that will contribute to a lengthy work reflecting the varied languages, accents, geography and cultures of Scotland.
Contradicting all of these latter generalizations is a lengthy work entitled Rhetoric in Ancient China, Fifth to Third Century B.C.E.
However, most cutting methods both cause damage to the nanotubes and involve a lengthy work-up procedure.
Mr Obama discussed the deepening crisis in Syria with other G20 delegates at a lengthy working dinner on Thursday night - and it was there, correspondents say, that their differences in opinion became obvious.
This led to a lengthy worked feud between Bret and his brother Owen, who defeated Bret in the opening match of the pay-per-view.
These plans emphasized the need for manned maintenance missions to the telescope to ensure such a costly program had a lengthy working life, and the concurrent development of plans for the reusable space shuttle indicated that the technology to allow this was soon to become available.
That Jerry Z. Muller, the book's author, has never written any lengthy works of Jewish history (a point he concedes in his acknowledgments but which is not picked up on by the reviewer) is no excuse for a lack of fundamental historical fairness.
