The phrase 'expend hours' is correct and usable in written English.
You can use it to refer to spending or using up time, often doing something arduous or time-consuming. For example, "I have expended many hours studying for this exam and I hope it pays off."
Often, the water destitute expend several hours each day simply fetching the family's water, which is very heavy to carry at 8 1/3 pounds per gallon, from the nearest potable source -- a burden that regularly falls on women and children, who sacrifice productive work and education to the process.
If Joe wants to buy a good that costs $48, Joe has to expend two hours of work in order to be able to purchase the $48 good, though he may at first glance believe he only has to work 1 and a half hours in order to make the $48 required to purchase the good.
I have expended 80 hours of labor and $2,000 in parts working on it.
"The special commissioner of investigation expended extensive hours investigating this," he said, "and concluded differently than Ms. Lam asserts.
The aim would be to impose a debt write-off significant enough to make future repayments manageable Yet while the world's policymakers have expended countless hours since the crisis of 2008 rewriting regulations on bonuses, mortgage lending, derivatives and too-big-to-fail banks, little attention has been paid to what should happen when a government is on the brink of financial meltdown.
But tax experts and the main accounting firms had stressed in consultations with the Treasury that it could expend thousands of hours and millions of pounds chasing wealthy tax dodgers and not achieve much extra revenue.
While overall hours expended will decrease, engineers may account for a greater share of the overall workload, or a new professional role – the structural modeler – may emerge.
In the process, they had also greatly reduced the number of calories that they typically expended during their hours at home.
"I can assure you the man and woman hours expended by UKA to try and persuade him to run were enormous.
