Because talking takes time.  And how much time it takes to talk depends in large part on how much time it takes to think of what you are going to say.  The time spent reveals how much thinking you did.  Here’s where truthtelling distinguishes itself.  The time it takes to tell the truth is just the time it takes to remember what actually happened.

The time it takes to lie is the time it takes to invent a lie, check that its consistent with the facts, and invent all of the subsequent lies you are going to have to tell in order for your whole story to hang together.

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