How Do You Fix Attribution in GA4 for Your Sales Cycle? Google Just Made It More Flexible

GA4 now lets you set any lookback window from 1 to 90 days for click-through conversions and 1 to 30 days for engaged-view conversions. Here is how to use this to stop misattributing revenue in long sales cycle businesses.

Attribution windows in Google Analytics have been quietly wrong for a lot of businesses for a long time. A fixed 30-day click-through window works fine for an impulse e-commerce purchase. It drastically underreports the value of paid channels for businesses where the average sale takes 45, 60, or 90 days from first click to closed deal.

Google addressed this on August 14, 2026, with an update to GA4 that replaces the previous preset lookback window options with fully custom values. According to Search Engine Land, advertisers can now set any value from 1 to 90 days for click-through conversions and 1 to 30 days for engaged-view conversions, replacing the former fixed options of 1, 7, 14, 30, 60, or 90 days for click-through and a rigid 3-day window for engaged-view.

For most businesses, the practical impact is the ability to match attribution windows to their actual sales cycles for the first time. Here is how to use it.

What Google Analytics Changed

Before this update, GA4 offered a limited set of preset options for conversion lookback windows. For click-through conversions, you could choose from 1, 7, 14, 30, 60, or 90 days. For engaged-view conversions (video views that result in a conversion), the window was fixed at 3 days with no option to change it.

The August 14 update replaces both of those with fully custom inputs. You can now type in any integer from 1 to 90 for click-through conversions, and any integer from 1 to 30 for engaged-view conversions. A 45-day click-through window, a 23-day engaged-view window, a 72-day click-through window for a high-consideration B2B purchase, all of these are now possible without workarounds.

The settings are available in Google Analytics under Advertising, then Conversion management, then Settings. They are also accessible through the linked Google Ads conversion management interface if you are importing GA4 conversions into Google Ads.

Why Attribution Windows Matter

An attribution window defines how long after a user clicks an ad or views a video that a resulting conversion gets credited back to that ad or campaign. A 30-day window means any purchase or lead that happens within 30 days of a qualifying interaction gets attributed to that channel. A conversion that happens on day 31 gets no credit.

For businesses with short sales cycles, standard windows are usually fine. For businesses with longer consideration periods, a mismatch between the window and the actual sales cycle means paid channels are being systematically undercredited. If your average client takes 45 days from first click to signed contract and your attribution window is 30 days, you are attributing a third of your conversions to direct or unassigned instead of to the campaign that actually started the journey.

That misattribution has real consequences. It leads to underinvestment in channels that are actually generating revenue, optimisation decisions based on incomplete conversion data, and reporting that consistently undervalues upper-funnel campaigns relative to last-touch channels.

The New Custom Window Options

The two conversion types with updated window controls are click-through conversions and engaged-view conversions.

Click-through conversions are the most commonly used type. Any time a user clicks an ad and then completes a conversion within the lookback window, the ad gets credit. The new range is 1 to 90 days, with any integer value permitted. Previously you were locked into 1, 7, 14, 30, 60, or 90 days, meaning a business with a 45-day cycle had to choose between undercounting at 30 days or overcounting at 60 days.

Engaged-view conversions apply to video ads, specifically to views that meet a certain engagement threshold, typically a 10-second video view, that later result in a conversion. The previous window was a fixed 3 days with no flexibility. The new range is 1 to 30 days. For brands running YouTube campaigns where the path from video view to purchase tends to take longer than 3 days, this is a meaningful change that will make video attribution more accurate.

How to Set Your Windows in GA4

The settings are in Google Analytics under Advertising, then Conversion management, then Settings in the left navigation. You will see the attribution window controls for both click-through and engaged-view conversions. Enter the number of days that matches your sales cycle analysis and save.

If you have Google Ads linked to GA4 and you are importing conversions, the window you set in GA4 will carry over to how those conversions are counted in Google Ads reporting. Review your linked conversions in Google Ads after making changes to confirm the settings have propagated correctly.

Note that changing the window is not retroactive. It affects how future conversions are attributed, not historical data. If you are running a comparison before and after the change, use date ranges that do not overlap the change date for a clean baseline.

Which Window Should You Use?

There is no single right answer, but a structured approach gets you there faster than guessing.

Analyse Your Actual Sales Cycle Length

Pull your CRM data and look at the time from first touch to closed deal for your last 6 to 12 months of customers. Calculate the median and the 90th percentile. Your attribution window should cover at least the median, and ideally reach the 90th percentile for channels you consider important. If the median first-touch-to-close is 35 days, a 30-day window is underreporting. A 45-day window is a reasonable starting point.

Consider the Conversion Type

Not all conversions have the same cycle. A newsletter sign-up is often a same-session or next-day action. A high-ticket service consultation might take weeks from first ad click to booked call. GA4 now lets you configure attribution settings independently for each key event, which means a newsletter signup and a $5,000 service enquiry do not have to share the same attribution logic. Set windows per conversion type where your cycles differ meaningfully.

Start Conservative, Then Extend

If you are unsure of your actual cycle length, start with a window that is slightly longer than your best estimate rather than shorter. Undercounting conversions leads to channel underinvestment. Overcounting is also a problem but is easier to catch once you have data showing what a realistic window looks like in your specific business.

Common Mistakes to Avoid

Using the Same Window for Every Conversion Type

GA4’s new flexibility is most valuable when used per-conversion, not as a single global setting. A brand with both micro-conversions like email signups and macro-conversions like booked consultations should configure each separately. Applying a 60-day window to an email signup inflates its reported credit from paid channels.

Changing Windows Mid-Campaign Without Noting the Date

Attribution window changes affect how future data is processed, not past data. If you change your window on August 14 and compare August performance to July without accounting for that change, your comparison will be misleading. Document the change date and use it as a breakpoint in any trend analysis.

Not Updating Google Ads After Changing GA4 Settings

If your Google Ads conversion actions are imported from GA4, verify after making window changes that the updated settings are reflected in Google Ads. Smart Bidding strategies in Google Ads use conversion data to optimise bids. If the attribution window changes how conversions are counted and Google Ads does not reflect that, your bidding algorithms will be working from different data than your reporting.

What This Means Going Forward

Custom attribution windows are not a new concept. They have been available in Meta Ads Manager and some third-party analytics platforms for years. Google is catching up by removing the preset constraints that forced many advertisers to accept a poor fit between their actual sales cycles and their GA4 configuration.

For teams running Google Ads alongside GA4 analytics, this is a useful moment to revisit attribution settings and check whether the current windows match your business reality. If your sales cycle is longer than 30 days and you have never changed GA4’s default, you are almost certainly underreporting the value of your paid channels in your analytics data.

At Incisive Growth, one of the most common findings in analytics audits is attribution windows that do not match the client’s actual sales cycle. This update makes fixing that straightforward. Use it.

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