<b>40% of my spend ran between 1am and 6am and converted at half the rate</b>

<b>40% of my spend ran between 1am and 6am and converted at half the rate</b>

The daily ROI looked fine. The hourly breakdown was hiding a leak.

<i>The setup</i>
— Lead-gen offer, $9 payout, search-feed traffic, ~$1,100/day, ROI 24%.
— I'd never once looked at the hour-of-day report.

<i>The move</i>
Pulled 30 days of data, bucketed conversions by hour. The overnight window was a graveyard.

<i>The numbers (illustrative)</i>
— 1am-6am: ~40% of spend, conversion rate 1.0%, ROI -20%.
— 9am-9pm: conversion rate 2.3%, ROI +51%.
— The good daytime hours were quietly subsidizing a money-losing night shift.

<i>The lesson</i>
A blended ROI number can hide two completely different campaigns inside one. Averages comfort you while a segment bleeds. The leak was invisible at the daily level and obvious at the hourly one.

<i>What I'd do differently</i>
Add dayparting from launch on any offer where intent is time-sensitive (loans, calls, B2B). I cut the overnight window and the same campaign jumped from 24% to 44% ROI without a single new creative. Pure waste removal.