I have seen it change well after the 4 or 5th comments.

In a childish move on my part I attempted to leave a poor rating after this person would not respond. I was the 8th person to rate that image and my low rating had zero effect on this persons score.

After that I quit commenting altogether on this person and started watching even more closely.

As a interesting side note the title of that image if taken in context of what I think is happening could have been both a dare or a threat.