The phrase "amass hours" is correct and usable in written English.
It can be used when referring to accumulating or gathering a certain number of hours, often in the context of work, study, or experience.
Example: "Over the summer, I managed to amass hours of volunteer work that will look great on my college applications."
Alternatives: "accumulate hours" or "gather hours".
The police amassed hours of tape but at no point in the recorded conversations was there any admission of guilt or any other evidence to use against Basterra and Porto (a court would also later declare the recordings inadmissible).
And as tens of millions of boomers move from being "time constrained" to "time affluent" over the next 20 years, they will collectively amass 2.5 trillion hours of leisure time (FIG 1).
He retired in 1973, having amassed 4,000 hours in the air and a host of decorations.
As a physician who practiced primary care internal medicine for 15 years, I amassed many hours of continuing medical education to update my knowledge of diabetes care.
Performers conducted interviews and amassed several hours of material, which became fodder for monologues of about 20 minutes, consisting entirely of the interviewees' real (but edited) words.
The newest addition is a seven-DVD "Concert Collection" that amasses 14 hours of concert and television performances from the late '50s through the '80s, when Sinatra the ardent crooner had given way to the imperial swinger.
For the filmed part of the project the division of labor went roughly like this: Mr. Smith, who stayed in character through his entire five days at the festival last summer, took a small film crew and amassed 11 hours of footage, mostly of people reacting to his character.
Over the course of six years, researchers amassed 116 hours of behavioural observations, which included 28 acts of oral sex between the two bears, who lived together in an enclosure at a sanctuary in Croatia.
McAfee's story, condensed: after refusing to pay a multimillion-dollar bribe in Belize, he instead donated to its government a slew of laptops infested with keyloggers and audiologgers, and amassed 17,000 hours of recordings which included evidence that the entire Belizean cabinet was in bed with people smugglers, money launderers, and the Sinaloan drug cartel.
Your student body amassed 110,000 hours of community service.
