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The phrase "How long is forever" is a rhetorical question that implies the concept of "forever" is infinite and timeless. When paired with "White Rabbit," it seems to be a reference to Lewis Carroll's "Alice's Adventures in Wonderland," where the White Rabbit is a character that leads Alice down a rabbit hole into a world of fantasy and confusion. In this context, the question might be suggesting a sense of wonder or the idea that time behaves differently in this fantastical world.

So, to answer your question in English and then translate it into Chinese:

English Answer:
"Forever" is a concept that represents an unbounded amount of time, extending from the past indefinitely into the future. It is not a measurable quantity but rather a philosophical and poetic term. When referring to the "White Rabbit," it could be seen as a metaphor for the unpredictable nature of time or an allusion to the story where time behaves in unusual ways.

Chinese Translation:
“永远”是一个代表无限时间的概念，从过去无限延伸到未来。它不是一个可测量的数量，而是一个哲学和诗意的术语。当提到“白兔”时，它可以被看作是对时间不可预测性质的隐喻，或者是对那个时间行为异常的故事的暗示。

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