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This is a great question. I think it really depends on your audience and the exposure of your ads. When your CTR starts to fade on a ROI positive campaign, it's time to change it up. I've seen some people recommend every 3-5 days.
Hi! It depends on the source of traffic, where you need to change creatives very often, where very rarely. In this case, we almost did not change the creatives, but often changed the offers as soon as offers ceased to make a profit. It worked for Propellerads.