
How long is a piece of string?
Uncertainty Context
Use when an exact number or amount cannot easily be given or is unknown.

How long will the meeting last? Well, how long is a piece of string?
Non-literal Use
Understand it's a rhetorical question, not expecting a literal answer about string.

How successful will the project be? That's like asking how long is a piece of string.
Avoid Overuse
Use sparingly to avoid vagueness in situations where specifics are important.

When budgeting, instead of asking 'How long is a piece of string?', seek exact figures.
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