The phrase "alarming amount of time" is correct and usable in written English.
It can be used to describe a duration of time that is concerning or surprising, often implying that it is longer than expected or acceptable.
Example: "The project took an alarming amount of time to complete, far exceeding our initial estimates."
Alternatives: "worrying duration of time" or "concerning length of time".
I wanted so badly to go to a particular kind of artsy college and mix with a particular kind of artsy crowd that I wasted an alarming amount of time during my senior year of high school throwing trash into various wastebaskets from across the room, saying, "If I make this shot, I get into Vassar".
Zenefits, which to the casual observer seemingly be spending an alarming amount of time developing a way to request and monitor time-off requests from a phone, actually sees that as a critical part of their business.
As someone who spent an alarming amount of time between the ages of 16-24 being told by politicians that "young people are the future" as they slapped us on the back and shuffled us out of the room, my gut instinct is to be cynical.
But blood tests showed she had an alarming amount of the drug in her system, five times the safe level.
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Schmeichel had to be alert to block Federico Santander's close-range attempt in the opening minutes, Youssef Toutouh's shot skimmed the roof of the net later in the half and an alarming amount of space opened up for the Copenhagen full-backs to exploit at times.
In the 40 years since the film came out, we've seen the live broadcasts of ISIS beheading journalists, "Survivor" contestants well up with tears as they ingest live insects, and Donald Trump, the real estate mogul and one-time host of "The Apprentice," running for the president of the United States (with an alarming amount of support).
An alarming amount of water also rose around a minimum- and medium-security prison about 20 miles north of Pine Bluff.
The army lost four of its men and an alarming amount of equipment while failing to disperse the protest.
On Twitter, I saw an alarming amount of anti-Christian taunts, comments such as "Those Christian Dogs".
