Pro tip: I set a hard 3-day rule on ad sets after burning $400 in one weekend on Lookalikes
Back in March I was running a test for a client in Phoenix, three lookalike sets at $50 a day each, all stacked on the same pixel, and I let them ride for 11 days because the dashboard showed a decent cost per click. Around day 4 the frequency hit 3.2 and the same people kept seeing the same creative, clicks stayed cheap but nothing converted, and I was too stubborn to kill it. By the time I finally pulled the plug I had spent $412 for two sales and a whole lot of angry feelings. What fixed it was boring: I now set a hard 3-day timer on any new ad set before I touch it again, and on day 3 I check frequency and cost per result, nothing else. If frequency is over 2.5 or I have no purchases, the set dies right there, no pep talk, no "let me try one more day." Last month that rule saved me on a cold audience test in Mesa, killed two sets at $60 total instead of letting them eat $300. Not saying 3 days is magic, it just stops me from falling in love with a loser. What day count do you all use before you kill a fresh set, and do you look at frequency first or cost per result?
Wait, frequency hit 3.2 by day 4 and you let it run another week? That number alone would've had me pulling the plug way earlier. Cost per click being cheap means nothing when it's the same 500 people clicking over and over.