Hey guys,
Well tonight I was wondering, how many days it takes you guys before a campaign dies?
I noticed that, it really depends on the audience, in my case, it might takes about 7 to 15 days before the ROI drops. (Fb Traffic of course)
Let's share our experiences 
I run on search, Sometimes I think my campaign dies, but it's just fluctuating and it's normal.
I look at my stats every week. & Compare Week by Week ROI.
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agree with enricbilly.
but it depends also on the offer if you are running CPL offer the chances on decreasing ROI higher than CPS offer.
Its different for every single campaign. Some campaigns never make any money. Others work well for a few days then go into the red and never come out of it. The good ones last a few weeks, months or sometimes even years!
It depends on the offer and on the traffic source you are using. Also, if the advertiser is still promoting the offer, even if its old, it means they're still making bank with it!
That being said eventually every campaign will die out and most probably you won't know when and how, so its important to upscale AS FAST AS POSSIBLE - just like in real life :-)