Talk:Smile Dog/@comment-4418057-20141231015858

How long can a .gif's loop last? If you were to cause the image to turn after a long period of time (15-30 minutes, maybe), it would scare the crap out of noobs.

Also, is it possible to make an image automatically change after a period of time even if the computer is turned off during that time? If so, this becomes an even better prank.