That's a big number, but the strange thing is that the woke up time is at a very short interval. Is there really an account farmer who manages that many accounts?
It's possible one person is in control of them and automated them so they can log in in those short time intervals. Just imagine, the difference of the login time is just 1 second and sometimes micro seconds
Here is just part of the seclog

I didn't check all of them, but it seems like most of the woke up accounts have been banned. Some of the ranked woke up accounts have also been banned.
I also randomly checked them and all the profiles I clicked on were banned. The most common cause of ban was spread malware. I am guessing most of these accounts were hacked back then and used to post malware. They were then reported and banned. The hacker is probably trying to check if there is any account that is not banned yet.