'laborious hours' is correct and usable in written English.
You can use this phrase to describe a time period that was particularly difficult or tiring. For example, "After months of laborious hours, the project was finally complete."
Out, along with the laborious hours of negotiation, will also go the meticulous rules for checking that each side is keeping its word.
That's 280 hearings and, assuming conservatively that each hearing lasts four hours, over 1,100 laborious hours targeted at the Obama administration and the Democrats, whether or not the subjects are worthy of investigation, let alone of any value to the American public.
While not even the testimony of experts can kill the Cinderella myth of instantaneous transformation, the truth is that after all the laborious hours, the lightening and tightening, the depilation and exfoliation, it comes down to one thing: we still need that magic spark to make us glow.
BERLIN (CLASSIFIED) ends in an explosion of rainbows that takes seconds to watch, but the laborious hours it must have taken to shoot and cut are palpable.
THIS is not the classic we had in mind: Boston 6, Yankees 2 in a laborious 3 hours 7 minutes that reinforced the idea that there is no such thing as a classic baseball game on April 16.
FEELING FIT AFTER FIVE SETS Andy Murray of Britain, seeded sixth, had just stormed back from two sets down against unranked Jürgen Melzer of Austria to pull off a 6-7 (5), 4-6, 7-6 (5), 6-3, 6-3 vinthey in thirdhiroundund in a laborious 3 hours 52 minutes.
"It was laborious; it took hours; it was not practical.
Depicting Chaney's transformation into a wolf was a laborious process necessitating hours of work.
While I was aware of the long hours and laborious reading that was involved in a law degree, I was oblivious to the world that lay beyond graduation.
But before any of that, somebody had to do hours of laborious, exacting work preparing articles about, and excerpts from, the papers for publication.
Proper, traditional (as opposed to modern "urban") Indian cooking is sophisticated, mysterious, intricate and, yes, can take hours of laborious preparation (there's no such thing as a "quick and easy 10 minute Indian").
