Reference
Time to First Value
How long it takes a customer to reach first value. Value arrives two ways, realized and recognized potential, and the term specifies neither, so two companies reporting 30 days can be timing different events. The definition is the metric. The number is what falls out of it.
What it is not
Not comparable across companies, or even across account types inside one.
Where it was staked
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Everybody measures TTFV. Almost nobody can tell you what the value is. It arrives two ways, realized and recognized, and a company reporting one number has picked one without saying which. The accounts that never receive a deliverable are where that gets expensive.