Time to fill and time to hire are routinely used as if they mean the same thing, but they measure different windows and point to different bottlenecks when they're too long. Conflating them leads teams to diagnose the wrong problem.
The actual definitions
Time to fill measures from the moment a requisition is approved and opened to the moment an offer is accepted — it captures the entire lifecycle, including how long it takes to attract candidates in the first place. Time to hire measures from a specific candidate's first meaningful contact (typically application or first outreach) to their offer acceptance — it captures process speed for candidates already in motion.
Why the distinction changes the diagnosis
- Long time to fill with normal time to hire usually means a sourcing problem: candidates take too long to find in the first place
- Normal time to fill with long time to hire usually means a process problem: interview scheduling, approval chains, or decision-making is slow once candidates are already engaged
- Fixing the wrong one wastes effort — streamlining interview scheduling doesn't help if the real problem is that too few candidates ever apply
- Tracking both separately, not just one blended 'time to hire' number, is the only way to tell which bottleneck actually needs attention
What to do once you know which one is the problem
A long time to fill points upstream, toward sourcing and candidate generation — the fix is more qualified candidate flow, not a faster interview process. A long time to hire points downstream, toward process — the fix is scheduling, approvals, and decision speed, not more candidates. Most organizations benefit from measuring both, because the fix for one does nothing for the other.
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