Use 'all hours' to show flexibility or openness in someone's schedule or availability.

Flexibility Emphasis

'All hours' can sound like an exaggeration, so use it to emphasize extremeness rather than literal accuracy.

Exaggeration Caution

Sometimes implies inconvenience or the excessive nature of an activity or situation.

Implies someone's actions are inconvenient or inconsiderate, often used with 'making noise'.

Reveals someone's lifestyle, hinting that they stay up late or wake up early regularly.

Used when describing actions that prevent others from getting a peaceful night's sleep.