Just so you know, some of us actually read through a chain of comments first, trying to get the full argument before making judgements, and then go back and upvote and downvote all the comments quickly in a row. So, that might seem like a bot doing it at the same time, but its just someone batch voting after reading.
As I said, certainly possible, I was just surprised by the distribution over time, not the distribution of vote type.
Just so you know, some of us actually read through a chain of comments first, trying to get the full argument before making judgements, and then go back and upvote and downvote all the comments quickly in a row. So, that might seem like a bot doing it at the same time, but its just someone batch voting after reading.