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A-theoretic conceptions of time hold that there is mind-independent passage. Recently, some B-theorists have joined them in holding that time really passes. These B-theorists diverge from A-theorists in holding that time passes in a way that does not involve commitment to a tensed picture of reality. Certain B-theorists of this type base temporal passage on relations of causal connectability, definable in spacetime. We argue that in this causal conception, calculating the rate of passage has strange results: The rate is variable, undefined, arbitrary, or zero. We argue that this presents a challenge for such B-theories.
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Baron et al. (2026) studied this question.
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