How long is a brick?

I'm curious, could you elaborate on the phrase 'How long is a brick?'. It seems to be a rather unusual query, given that bricks are typically measured in dimensions like length, width, and height, rather than a duration of time. Is this perhaps a metaphor for something more abstract, or is there a specific context in which this question arises? Could you provide some insight into what you might be referring to, and what kind of answer you're seeking?