A second is enough time to consciously register an ad. To prove it, they could run a bit where someone shouts "50 percent?!" with a picture of an iPad and "Tap!

A second is enough time to consciously register an ad. To prove it, they could run a bit where someone shouts "50 percent?!" with a picture of an iPad and "Tap! 50% off". I'll bet people start tapping by the second or third impression (even though it's obviously a scam of some kind).