Seven years. That’s the average length of a client-agency relationship today, according to a 2025ANA/4As study — more than double the 3.2-year average the same groups reported back in 2016. Experiential agencies run even longer, averaging a decade. By almost any measure, agency relationships are getting more stable, not less.
Stability gets treated as proof the relationship is working. It isn’t, necessarily. The same study shows why: clients with no mandatory review process average 8.1 years with an agency. Clients who run regular reviews average 3.8. Remove the accountability, and tenure goes up — not because the work gets better, but because nobody’s checking.
That gap between “still here” and “still earning it” is where coasting lives. And it’s harder to spot than a bad pitch or a missed deadline, because nothing dramatic happens. The relationship just quietly stops being challenged.
Stable and Stalled Look Identical From the Outside
A coasting agency still ships on time. Invoices go out, decks look fine, the brand doesn’t visibly break. That’s exactly what makes it dangerous — there’s no event that forces a conversation. A missed deadline gets escalated. A slow fade into “good enough” rarely does.
The tell isn’t in what’s delivered. It’s in what’s stopped being asked.
Five Signs the Relationship Has Gone Comfortable
- Every recommendation sounds like the last one. The strategic point of view that won the account three years ago is still the point of view today, applied to a market that’s moved.
- Pushback has disappeared. Early on, a good agency tells you when a request is a bad idea. A coasting one starts saying yes to everything, because disagreement risks the relationship more than a weak deliverable does.
- The team has quietly junior-ed down. Senior strategists who ran the first year’s work have rotated onto new business, replaced by account staff executing a playbook nobody’s revisited.
- Reporting measures activity, not outcomes. Decks fill up with deliverables shipped and campaigns launched — not with what moved, and what didn’t.
- Nobody can remember the last hard conversation. Not a conflict — a real one, about whether the current approach is still the right one.
Any single item on that list could be a quiet quarter. All five, sustained, is a pattern.
None of these show up on an invoice. That’s the point. A coasting agency isn’t underbilling or underdelivering against the scope of work — it’s quietly narrowing the scope of its own thinking, one unchallenged brief at a time, until “what the client asked for” has fully replaced “what the brand actually needs.”
Why Nobody Catches It in Time
This isn’t usually negligence on either side. It’s structural. Switching agencies is expensive and disruptive, so clients give the benefit of the doubt longer than they should. Agencies, meanwhile, optimize for retention — and the easiest way to keep an account isn’t necessarily to keep pushing it forward, it’s to keep it comfortable. Friction-free is mistaken for healthy.
The irony is that this works against both sides. A brand that stops being challenged drifts out of relevance slowly enough that nobody notices until a competitor’s rebrand lands and the gap suddenly looks obvious. And an agency that’s stopped pushing is one pitch away from losing the account anyway — just on someone else’s timeline, usually with less warning. By the time a new CMO arrives and asks why the brand looks the way a competitor’s did three years ago, the comfortable relationship doesn’t get a chance to explain itself. It just gets replaced.
A Quarterly Gut Check
The fix isn’t firing an agency the moment tenure crosses some threshold — the ANA/4As data makes clear that long relationships can be the strongest ones, when they’re earned. The fix is building in the review a comfortable relationship otherwise never gets. Four questions, asked honestly, once a quarter:
- What has this agency told us “no” to in the last ninety days?
- If we put this account out to pitch tomorrow, would the incumbent team be nervous?
- Who on the agency side has actually been in a room with our business this quarter — not just on a call?
- What’s one assumption this engagement was built on that no longer holds?
A strong agency relationship should survive those questions easily. A coasting one starts sounding evasive by question two.
Trust Has to Be Re-Earned, Not Assumed
Tenure is a reasonable proxy for trust, and trust is worth protecting — switching partners has real costs, and a long relationship built on genuine performance is an asset, not a red flag. But trust that’s stopped being tested isn’t trust anymore. It’s inertia wearing trust’s name tag.
The agencies worth keeping for seven years are the ones still acting like they could lose the account next quarter. That posture doesn’t happen by accident, and it doesn’t survive on autopilot — it’s a discipline both sides have to keep choosing, long after the account is no longer new.
