Every brand has a reorder flow that fires on day 30. It’s the default. Set it and forget it. The problem is that day 30 has nothing to do with when your customers actually need to reorder. It’s a round number chosen because round numbers feel safe. They aren’t.
Why the default timing is wrong
A customer who buys a 90-serving protein tub and uses two scoops a day will run out in 45 days. A customer who uses one scoop every other day needs 180 days. Sending both the same reorder reminder on day 30 means one gets it too early to act and one forgot you existed months ago. Neither outcome helps retention.
Most platforms give you a sequence of delays. None of them know your customers’ actual consumption patterns. The result is a flow that’s precisely wrong for almost everyone it touches.
What the data actually shows
If you pull order history for customers who made a second purchase of the same product, you’ll find a reorder curve — a distribution of days between order 1 and order 2. That distribution isn’t centered on 30. It’s usually centered on something product-specific: the natural depletion rate adjusted for how your particular customers actually use the product.
The peak of that curve is your real reorder window. It varies by SKU, by purchase size, and sometimes by customer segment. But it’s always in the data, waiting to be found.
Three ways to use the real window
- Per-SKU timing. Build a reorder flow for each product anchored to that product’s actual median repurchase day, not a shared default.
- Quantity-adjusted timing. A customer who bought a double pack needs twice as long. If you capture quantity data, factor it in.
- Early-signal detection. Some customers browse the product page or open the same promotional email before they rebuy. Catch that behavior and reach out earlier, before the gap becomes a lapse.
The brands that win on retention aren’t sending more emails. They’re sending the right one at the right moment — and that moment is different for every SKU.
What to do this week
Pull your order data. For each of your top five products by repeat purchase rate, calculate the median days between first and second purchase. Plot the distribution. You’ll immediately see that day 30 isn’t the answer. Then adjust your flows to lead into the real window — reach out two to three days before the median, not after it.
The lift is usually immediate. Customers who get the reminder when they’re actually running low don’t need a discount. They just need the reminder.
Key takeaways
- Default 30-day timing is almost always wrong for almost every SKU.
- Your order history already contains the real reorder curve — it just needs to be read.
- Per-SKU timing outperforms global delays by a significant margin.
- Customers who get timely reminders rarely need a discount to convert.