Recruiting gets measured by time-to-fill because time-to-fill is easy to measure. You can put it on a dashboard, compare it across quarters, and feel the satisfaction of a number going down. It is a real metric, and it is the wrong one to lead with.
Speed tells you how fast a seat was filled. It tells you nothing about whether it stayed filled. A search that closes in three weeks and unravels at month nine is a slow, expensive one wearing a fast one's clothes. The same role, run twice, with a year of disruption stitched in between.
The metric that matters is retention at twelve months. It is harder to measure, slower to report, and it is the only number in hiring that compounds.
Speed is a checkpoint, quality is the outcome
Time-to-fill is a speed metric. Retention is a quality metric. The two are easy to confuse because both involve the same hire, but they answer different questions. Speed asks how quickly the process moved. Quality asks whether the process found the right person. Only one of them shows up in the company a year later.
Quality compounds because a person who stays keeps producing. They learn the product, build the relationships, mentor the people hired after them, and carry context that no replacement can be handed on day one. Speed does not compound. A fast hire who leaves takes all of that with them, and the clock you were so proud of resetting quickly resets again, this time from behind.
The cost of a placement that leaves
Run the cost of a hire who leaves at month nine. You pay for the search again. You ramp the replacement again, weeks before they are productive. And you absorb the gap in between, where the work the seat was meant to do lands on whoever is nearest. Replacement cost is commonly estimated, as an industry rule of thumb, at 100 to 200 percent of annual salary, and most of that number is the ramp and the disruption, not the recruiting.
A cheap, fast placement that does not last is the most expensive hire you can make. The invoice was small. The cost was not. It is just that the cost arrived later, spread across a year, where it is hard to trace back to the decision that caused it.
A placement that leaves at month nine costs you the search twice, plus the ramp in between.
Ask for the number
There is a simple test for any recruiting partner, and it cuts through every pitch. Ask them their twelve-month retention rate. Ask what share of their placements are still in the seat a year after they signed.
A firm that measures quality will have the number ready, because they track the thing they are proud of. A firm that competes on speed will not, because nothing in their model requires them to look. The answer to the question is less important than whether they can answer it at all. A partner who cannot produce a retention number is telling you they have never been paid to care about one.
Our own number is the reason we lead with it. FoundHuman placements show 93 percent retention at twelve months, roughly twice the industry average. We back it with a 15-month placement guarantee, about five times the industry standard, because a firm that believes its own retention number should be willing to stand behind it for longer than anyone else.
What compounds
Hire for retention and the gains accumulate. Each person who stays makes the next hire easier, the team stronger, the institutional memory deeper. Hire for speed alone and you run on a treadmill, filling seats quickly, losing them quietly, and filling them again, never quite getting ahead of the churn you created.
Time-to-fill is worth watching. It is just not worth optimizing for on its own. Ask your partner for the retention number first. What they say, and whether they can say anything at all, will tell you most of what you need to know.