I'm curious if anyone uses ad scheduling in their campaigns. I'm starting to think it may be helpful to me, and here's why:
I have a small budget for my adwords campaign (a whopping $10/day) and my CTR's are pretty high, anywhere from 15% down to around 2.5%. My budget usually kicks out by lunchtime. Through this time of day my traffic is almost exclusively PPC.
Then the organics start hitting the site around 3-4 pm and continue strong to around 8-9pm. I've noticed that the while the PPC visitors usually linger around 2.5 pages per visit, the organics can stay for 5-10 pages easy.
Now, the question is, did the visitors 'arriving the natural way' spend more time because the quality of the result matched their search (from my logs, I'd say maybe yes half the time) or did they spend more time due to the time of day? It's near quitting time, or maybe waiting for the spouse to come home... looking on the internet after dinner...that kind of thing.
If my theory about the time of day is true, then maybe it makes sense to schedule the PPC campaigns to crank up around 4pm - when a visitor is more likely to stay awhile.
Does anyone else's experience confirm or refute this?

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