The phrase "an exceptional amount of" is correct and usable in written English.
It can be used to describe a quantity that is significantly greater than what is usual or expected.
Example: "The project required an exceptional amount of resources to complete successfully."
Alternatives: "a considerable amount of" or "a significant amount of".
For places so small, both towns have nurtured an exceptional amount of standout hockey talent.
Nor do owners of these houses use their space for an exceptional amount of entertaining.
Which sounds like an exceptional amount of rain, but just how unusual is this kind of event?
She has been involved with Great Gull Island for 32 years, an exceptional amount of time for a field researcher.
They show that a place can produce some works of genius and have an exceptional amount of wealth, talent and productivity without achieving the highest artistic level.
The networks were careful to say that they still planned to devote an exceptional amount of coverage to the Republican convention, if and when it began in earnest.
President Obama accomplished an exceptional amount during the life of his administration.
She drew praise from Assistant Principal Branch for "new and innovative ways" of engaging parents, "dedicating a truly exceptional amount of time towards partnering with them," through invitations to class events and walking home students who live nearby.
Edna went off to enjoy her dance class, wearing a more exceptional amount of nail polish than usual.
The Patroller's Barnstar: For a consistent and exceptional amount of patrolling.
Many fail to realize the exceptional amount of dollars worth of what are essentially bribes, spent on physicians every year in addition to the billions of dollars worth of drug samples given to doctors which effectively result in prescribing patterns.
