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Metrics type: Cross-Platform Metrics • Category: Email Marketing
Distribution of hours-to-purchase after a campaign send. Tight cluster <24h = strong send; long tail = weak hook.

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At a glance

The distribution of hours between a Mailchimp campaign send and the resulting attributed purchase, computed across the top 10 revenue-generating campaigns in the period. Buckets: <1h, 1-4h, 4-12h, 12-24h, >24h. A tight cluster <24h means the campaign hooks immediate-purchase intent (good); a long tail beyond 24h means the campaign builds awareness but doesn’t drive immediate action (the hook is weak). Mailchimp’s 24h click attribution default means anything beyond 24h is unattributed; the >24h bucket here captures click-then-bookmark-then-buy patterns visible only via UTM matching.

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Calculation

Calculated automatically from your Mailchimp data. See the At a glance summary above for what the metric tracks and the worked example below for a typical reading.

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Worked example

A small DTC kitchenware brand on Shopify, Mailchimp Standard. Top 3 campaigns over 90D window 02 Feb 26 to 02 May 26. Five observations:
  1. Mother’s Day’s lag profile is textbook strong. 70% of orders within 4 hours of send, 84% within 12 hours. The campaign creates immediate purchase intent because the deadline (Mother’s Day) is concrete and the product is gift-able. A campaign with this lag profile justifies the broadcast send model, you’re hitting an intent-rich window.
  2. Spring sale is good but slower than Mother’s Day. The flash sale draws purchases over a longer window (24% in the 4-24h bucket) because customers want to compare before buying. This is healthy for promotional sends; the 3-day duration of the flash matches the buying-cycle behaviour. Don’t push customers harder; let them browse.
  3. The March newsletter is a weak hook. 50% of orders fall in the >24h bucket, which means the newsletter raised awareness but didn’t drive action. Customers came back days later via direct visits or organic search. Mailchimp’s 24h attribution doesn’t credit these orders, so the newsletter’s reported revenue understates its actual contribution. For awareness-style sends, Email Share of Total Store Revenue is the better metric than per-campaign attributed revenue.
  4. The list-based blast pattern shows up in the lag distribution. Mother’s Day went to the full list including dormant subscribers; among the dormant subscribers who did buy, lag was longer (because they need more time to re-engage with the brand). Segmented sends to “engaged 60d” subscribers would produce a tighter lag profile across all three campaigns. This is the segmentation-vs-list debate quantified.
  5. The >24h bucket is the under-credited revenue bucket. Mailchimp doesn’t attribute orders beyond 24h to the campaign that drove awareness. For awareness-heavy newsletters and brand campaigns, the >24h share can be 30-60%, meaning Mailchimp’s e-commerce-attributed revenue substantially understates the actual contribution. Use this card to identify newsletters where the long tail is doing real work.

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Sibling cards merchants should reference together

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Reconciling against the vendor’s own dashboard

Where to look in Mailchimp’s own dashboard: Mailchimp does not surface this distribution natively. The closest views are Mailchimp → Reports → individual campaign → E-Commerce tab which shows orders per campaign without lag bucketing, and Mailchimp → Reports → Comparative Reports which doesn’t bucket by lag either. This card is a Vortex IQ-derived distribution computed by joining Mailchimp send_time with commerce platform order created_at. Why our number may legitimately differ from a hand-built calculation: Cross-connector reconciliation (this is the central purpose):

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Known limitations / merchant FAQs

What does a “good” lag distribution look like? For promotional / tentpole campaigns: 60-80% of orders within 4 hours of send. For awareness / brand campaigns: a flatter distribution with 30-50% in the >24h bucket is normal and acceptable. Don’t apply promotional benchmarks to brand sends and vice versa. Why is so much of my newsletter revenue in the >24h bucket? Newsletters typically build awareness rather than drive immediate purchase. Customers read the content, get a positive impression, and return organically days later when they need the product. Mailchimp’s 24h click attribution doesn’t credit these orders. The >24h bucket is the under-credited revenue, real but invisible to Mailchimp’s reports. How can I tighten the lag on a campaign? Three levers: (1) add concrete urgency (deadline, low stock, “ends Sunday”); (2) use product-led subject lines with specific items rather than abstract themes; (3) send at peak inbox-check times (Tuesday-Thursday 10am or 7pm UK) so opens happen close to send. Tightening lag from 12-24h to <4h typically lifts attributed revenue 30-50% because more orders fall inside the 24h attribution window. My lag is bimodal, a peak <1h AND a peak at 24-48h. What’s that? Two-segment audience. The <1h peak is your high-intent loyal subscribers. The 24-48h peak is recipients who waited for end-of-day or weekend before buying. This is healthy and reflects two genuinely different customer populations. Don’t try to flatten it; segment instead. Why would I want a long lag? For high-AOV / considered purchases (furniture, electronics, B2B subscriptions). Customers research over days. A long lag means your email seeded the consideration phase. The trade-off: long lag means most revenue falls outside Mailchimp’s 24h window and isn’t attributed back, so you’ll under-report email’s contribution. Use Email Share of Total Revenue for the honest measure. Does this card include orders from forwarded emails? Yes if the forwarded recipient still has the UTM parameters intact when they click. Most webmail clients preserve UTM on forward; some Outlook variants strip them. Forwarded clicks may show a longer lag because the forwarder typically sends 1-2 days after receiving. Why is the today value volatile? The lag distribution is computed across the top 10 campaigns over 90D, so daily readings only shift if a new campaign enters the top-10 ranking. For most accounts the distribution stabilises after the first 14 days and moves slowly thereafter. My lag distribution shifted dramatically month-over-month, what happened? Most likely you changed your campaign mix. Adding more promotional / discount campaigns tightens lag; adding more newsletter / brand campaigns lengthens it. Cross-check with Top Campaigns by Revenue, if the top-10 changed substantially, the distribution change is structural. Does the long tail >24h work for Customer Journey emails? Customer Journey emails have a different lag pattern because they trigger on behaviour. Abandoned-cart emails go out 1h after cart creation, so lag from send to purchase is naturally tight (<4h for 70%+). This card excludes Customer Journey emails for that reason; their lag distribution would distort the campaign-level comparison. Should I optimise for the <1h bucket? For promotional sends, yes. For everything else, no. The right metric is total revenue from the campaign, not lag. A campaign with 30% <1h and 40% 4-24h drives more revenue than one with 80% <1h on a small spike, because the longer-engaging audience spends more total. Use lag as a diagnostic for campaign type-fit, not as a target.

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Tracked live in Vortex IQ Nerve Centre

Top Sends → Purchase Lag is one of hundreds of KPI pulses Vortex IQ tracks across Mailchimp and 70+ other ecommerce connectors. Nerve Centre runs the detection layer; Vortex Mind investigates the cause when something moves; Ask Viq lets you interrogate any number in plain English. Start for free or book a demo to see this metric running on your own data.