Time to Proficiency
The elapsed calendar time from a new support agent's start date to the point they consistently meet production targets and handle the large majority of contacts without help — a measure of ramp, not of training length.
Time to proficiency = date agent first sustains production targets (AHT, QA, CSAT) while handling ~90% of contacts unaided − start dateTime to proficiency measures the elapsed calendar time from a new agent's first day to the point they can hit production standards — average handle time, QA scores, CSAT — and work independently. The common field definition of "proficient" is an agent who can handle roughly 90% of contacts without asking a neighbor or a manager for help. The formula is deliberately blunt: the date the agent consistently clears that bar, minus their start date (AIHR). Note what it is not — it is not the length of the training class, and it is not the day someone passes a final quiz.
That distinction is the whole point. Contact centers commonly report 4–8 weeks of formal ramp — classroom plus nesting — but broader HR data puts genuine full productivity at up to eight months to a year, and complex products stretch it further. The weeks between "released from nesting" and "actually self-sufficient" are expensive: every contact a not-yet-proficient agent escalates or hands to a neighbor quietly taxes a proficient one.
To measure it honestly, tie the end point to a sustained performance threshold rather than a calendar milestone — for example, two consecutive weeks clearing your QA and AHT targets with an unaided rate above bar. Anything measured to a fixed date only tells you how long your onboarding schedule is, not whether it worked. Pair the number with coaching and agent-experience signals so you can see why a cohort ramps slowly, not just that it did.
What it hides: The metric quietly assumes the agent stays long enough to pay the ramp back. With average agent tenure at just 14–15 months and first-year attrition of 69–73%, a newly "proficient" agent is often already past the midpoint of their stay — so a tidy ramp figure can mask the fact that you are re-paying it two or three times a year. And because "proficient" is self-defined, a suspiciously fast time to proficiency usually means you relabeled "off nesting" as "done," not that anyone actually reached the bar sooner.