There's no single right number of clients per account manager. For most agencies the limit is set by hours, and you can find yours in about ten minutes by adding up weekly meetings, reporting and fire drills per account, then dividing what's left by your client count. If that leaves less than an hour of real focus work per client per day, you are past the limit, whatever the headcount plan says.
I wrote this after reading a thread in r/advertising this week. An account lead with years of exec experience described juggling "8 to 10 clients at a time, with broad responsibility as the sole point person (and scope is always creeping)." They had about an hour or less of focus work per account per day before meetings, and every client expected an hour-long weekly meeting with "detailed reporting, decks & action plans." Their words: "Lately I feel so constantly behind... I've almost stopped trying to catch up."
The replies were telling. One commenter wrote that "8 to 10 accounts as the only point person, with scope creep, is a staffing problem more than a motivation one." Another put it as "8-10 clients, no matter how small, are still TONs of info to keep tabs about." I agree with both, and I think most agency owners underestimate how fast that load adds up.
Start with the week instead of a benchmark. Benchmarks from other agencies tell you nothing about your service mix, your meeting cadence or how demanding your clients are.
Here's the math using the numbers from that Reddit post. Take a 40-hour week. Ten clients with a one-hour weekly meeting each is 10 hours. If each meeting needs an hour of prep for the deck and report, that's another 10. Internal standups, Slack and email triage easily take 5 more. That leaves 15 hours for actual work across ten accounts, or 90 minutes per client per week. Then one client fire eats a Tuesday.
Run the same math with five clients and the account manager has roughly 3 hours per client per week for strategy, optimization and creative thinking. That is the part clients actually pay for, and it's usually the first thing to disappear when the roster grows.
Use this as your rule: the right number of clients per account manager is the number where every account still gets protected focus time each week. If you can't name when that time happens on the calendar, you have too many.
Three things compound, and most agencies only plan for the first.
The first is visible time: meetings, reports, decks. Everyone counts this.
The second is switching cost. The American Psychological Association's summary of multitasking research notes that each switch between tasks costs only a little, but the costs add up, and psychologist David Meyer estimates that these mental blocks can cost as much as 40 percent of someone's productive time. An account manager with ten clients changes context all day, between brands, voices, data sets and stakeholders. A former agency copywriter in the same thread said it plainly: "It's hard to get invested when you're constantly switching voices and strategies."
The third is coordination work. Asana's Anatomy of Work Index 2022, a survey of 10,624 knowledge workers, found people spend 58% of their day on "work about work" such as chasing status updates and searching for information, and less than 10% on strategy. In an agency, a big share of that coordination is clients asking questions the account manager has answered before.
The Reddit poster listed most of them without meaning to. Watch for these:
The World Health Organization defines burn-out as a syndrome from chronic workplace stress that hasn't been managed, marked by exhaustion, mental distance or cynicism toward the job, and reduced professional efficacy. "I've almost stopped trying to catch up" fits that description closely. When it shows up in a strong employee, look at the load before you look at the person.
Here's the framework I'd use if I ran a 10 to 30 person agency today.
One of the best replies in the thread suggested writing down "what each client actually pays for vs what you're doing for them this month" and taking it to your boss as a "which of these do I drop or who takes them" conversation. Numbers land better than how you feel. If you own the agency, do this audit yourself before your team has to.
Not every client needs a weekly hour with a full deck. A $15k a month retainer might. A $3k one can usually get a biweekly 30 minutes and an async written update. Cutting four hours of meetings and four hours of prep a week gives an account manager back a full day.
The same commenter suggested blocking a couple of mornings a week for real work on the largest accounts. As they put it, "the small ones survive getting a reply in 4 hours instead of 20 minutes." Most clients are fine with a slower reply if they know when it's coming.
This is the one most agencies miss. A large share of client contact is repeat questions: how do we handle this, what did we decide about that, what's the playbook for this situation. Each one is a small interruption, and each one only your account manager or your founder can answer, because the answer lives in their heads, old Slack threads and call recordings.
This is the problem we built Gia around. Gia turns your firm's playbooks, methodologies, past calls and Slack history into a company brain your clients can ask directly, under your brand, in a browser, in Slack, or inside the AI tools they already use like ChatGPT and Claude. Each client only sees what's meant for them. Your account manager stops being the bottleneck for "how do I" questions and gets that time back for the strategic work, and you can bill clients for the access if you want to.
A commenter in the thread pointed at the root cause: in an hours-based model, "there will always be a tension between employee time and making money." Hiring another account manager moves the ceiling up by a few clients. Productized tiers, async deliverables and client self-serve move it further. We wrote more on that in our piece on productized agency services.
Say you run a 15-person performance agency. Two account managers carry nine clients each, all on weekly calls. Both are working late, one just missed a reporting deadline, and you're thinking about hiring a third.
Before you post the job, run the audit. You find that four of the eighteen clients are under $4k a month and could move to biweekly calls with written updates. That frees about 8 hours a week per account manager. You also find that roughly a third of client Slack messages are questions you've answered before for someone. Give clients a way to get those answers on their own and each account manager gets a few more hours back. You may still need the hire next quarter, but you'll make that call with real numbers.
It depends on retainer size and service complexity, so calculate it from hours. If an account manager can't protect at least a few hours of focus work per client per week after meetings and reporting, the load is too high. For many full-service retainers with weekly meetings, that line arrives well before ten clients.
For a sole point person handling weekly meetings, detailed reporting and scope creep on every account, usually yes. The Reddit poster at that load had about an hour of focus time per account per day before meetings and described skipping parts of deliverables. With smaller retainers, async reporting and support from specialists, 8 to 10 can work.
Change the process first, then hire. Tiering meeting cadence, blocking focus time and cutting repeat client questions often frees a full day per person per week. If the math still doesn't work after that, the hire is justified and easier to defend.
Check whether the warning signs started when the roster grew. If a strong performer started missing deadlines, skipping review steps and pulling back from client comms after picking up more accounts, it's almost certainly the load. The WHO describes burn-out as the result of workplace stress that hasn't been managed, so fix the conditions first.
If your account managers spend their week answering the same client questions, I'd like to show you how a company brain takes that load off them. Book 30 minutes with me here: calendly.com/bailey-myagiea/30min. Bring your client roster and we'll work through the math together.