
A devil of a job/time
Emphasis on Difficulty
The phrase adds strong emphasis to how hard a task is, often more than just 'difficult'.

Organizing the charity event turned out to be a devil of a job with the tight budget.
Emotional Frustration
Use it to express personal frustration due to the challenge faced.

Trying to calm the unhappy customers was a devil of a job that left me exhausted.
Colloquial Colour
It's conversational English, so it fits better in informal talks than formal writings.

She's had a devil of a job decorating her new home, but she loves doing it.
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