Paid ads can produce clicks and the first leads within days, but most small businesses need about four to six weeks to see a stable cost per lead and around three months to judge whether the channel is profitable. The timeline stretches with low budgets, long sales cycles and weak tracking, and it shrinks with a clear offer and a decent conversion path.
Business owners ask us this in the first call, usually because someone has told them ads “should work in a week”. Below is the 90-day timeline we use, what should happen in each phase, and the rules for deciding at the end. The ranges are our experience-based guidance, not guarantees; your market will differ.
Why isn’t there one number?
Three variables decide how fast you learn:
- Budget: the platform and you both need data. A campaign producing 40 conversions a month tells you more in three weeks than one producing 4.
- Sales cycle: if a customer takes eight weeks to decide, revenue from this month’s ads will arrive after your three-month review.
- Starting point: a business with clear pricing, proof, a decent site and tracking is ahead of one that needs all four built.
Platform learning matters too. Automated bidding in Google Ads and delivery optimisation in Meta both improve as they collect conversion data. Google’s own guidance for automated bidding suggests allowing a period of learning after changes, and Meta describes a learning phase that ends once an ad set has produced enough conversions; check the current thresholds in their help centres, since they change. Our post on the Meta Ads learning phase explains how to avoid resetting it.
Weeks 1–2: Set-up and learning
The first fortnight is about getting clean data, not performance. If you have not set up the basics, this is where you do it.
- Conversion tracking tested end to end, including form submissions and calls.
- One clear offer and one landing page per main service.
- Two to three ad variants per campaign, so the platform has something to compare.
- Written targets: the maximum cost per lead you can afford, which you can work out from your close rate and average sale value.
Expect volatile numbers. Costs per click and per lead will swing day to day, and one lucky or unlucky lead moves the average. The right action in this phase is mostly to leave things alone and fix anything that is obviously broken, such as a form that does not submit. Resist the urge to change bids, audiences and ads every other day; that resets learning and muddies the data.
What success looks like at the end of week two: tracking works, the budget is spending, you have your first leads or at least a healthy volume of qualified clicks, and you know where the traffic is coming from.
Weeks 3–6: Diagnosis and tuning
This is where an experienced advertiser earns their fee. With a few weeks of data, patterns emerge.
On Google Search, read the search terms report, add negative keywords, pause clearly poor terms, and review which ad copy earns clicks. We have a 30-minute routine in our search terms report guide. On Meta, compare creative performance, check placements and frequency, and look at whether the audience is saturating.
Judge each change with enough data. A rough rule is to wait for at least several hundred clicks, or 30 or more conversions where possible, before you declare an ad or audience a winner. At small budgets that can take most of this phase.
The key metric here is cost per lead, then lead quality. Count a lead as good only when the sales team confirms it was a real prospect. If cost per lead is inside your target and quality is acceptable, you are on a path to profitability. If cost per lead is two or three times target, work through the funnel in order: tracking, traffic quality, the landing page, the form and the offer, changing one thing at a time. Our two-hour conversion audit is a good starting point for the page side.
What success looks like at the end of week six: a cost per lead you trust, a short list of what works and what does not, and a decision about which campaigns deserve more money.
Weeks 7–12: Scale, hold or stop
By now you should know whether the channel can work. The last six weeks are for increasing budget on what works, tightening what does not, and tracking leads through to revenue.
Scale gradually. Raising budgets by around 20 per cent at a time and checking results for a few days is a safer habit than doubling overnight. Watch cost per lead as spend rises, because costs usually increase as you reach less responsive audiences. If you are planning a larger push, our Meta Ads account structure for a €5k/month budget and €10k/month paid media budget structure posts show how to allocate it.
Start to connect ads to revenue now. If your sales cycle is long, check how many leads have become opportunities, and use that as the proxy until sales close. If you cannot connect the two, fix that before spending more; call tracking and offline conversion import is one way to do it.
A 90-day summary table
| Phase | Main job | What to avoid | Question to answer |
|---|---|---|---|
| Weeks 1–2 | Clean tracking, launch, collect data | Constant changes | Is the data trustworthy? |
| Weeks 3–6 | Cut waste, test ads and offers | Judging on too few clicks | Is cost per lead in range? |
| Weeks 7–12 | Scale winners, link to revenue | Doubling budgets overnight | Is it profitable at the margin? |
What if the budget is small?
At low budgets the same phases take longer, because each takes more calendar time to gather the same number of clicks. If your daily budget buys only a handful of clicks, you may need five or six months for a trustworthy read, or you should narrow the scope: one campaign, one location, one offer. Our post on the minimum budget to start Google Ads or Meta Ads goes into the arithmetic.
What about long sales cycles?
If your customers take two or three months to buy, paid ads will look unprofitable at day 90 even when they are working. In that case use leading indicators: qualified leads, booked meetings and proposals sent. Agree in advance which indicator counts as success at day 90, and plan the revenue review for day 180.
Set your decision rules before you launch
The most useful thing you can do this week is write three sentences:
- “We will continue if cost per qualified lead is below €X by week 12.”
- “We will scale if it is below €Y and lead volume is at least Z a month.”
- “We will stop or change the offer if it is above €W after we have fixed tracking, page and targeting.”
Working out X, Y and W requires your close rate and average customer value. As an illustration: if you close one in five qualified leads and a customer is worth €1,500 in gross margin, a qualified lead is worth about €300, so a cost per lead of €100 leaves room for profit and one of €280 does not. Those figures are invented for the example; use your own.
Written rules turn the week-12 review into a decision rather than an argument. They also help you judge an agency fairly, which we cover in how to vet a paid media agency.
FAQ
Can ads work in the first week?
You can get clicks and sometimes leads in the first week, but the numbers are too noisy to judge. Treat week one as a test of the set-up rather than of the channel.
How long should I give a new agency before judging them?
Judge the process in the first month (tracking, reporting, communication) and the results over about three months, with the caveats above about budget and sales cycle.
When should I stop running ads?
If tracking, targeting, page and offer have all been checked and cost per qualified lead stays well above what you can afford after about three months of adequate budget, stop or change the offer rather than adding more spend.