The work of a moment, second, etc.
Definition 1 of 1

Speed of Action
Indicates a task done quickly, often implying it requires little effort.

She answered the question, it was the work of a second.
Not Instant
Clarifies that some tasks are complex and can't be done instantly.

Writing a novel isn't the work of a moment.
Subjective Time
It can be subjective; what is quick for one person may not be for another.

To a skilled chef, preparing a meal is the work of moments.
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