I haven't weathered the hundred plus day wait yet, so to me a hundred days does seem like an excruciatingly long wait! But, I just subbed to Bull Spec AND Electric Literature three days ago, which, I'm sure you know, are both steady at around 200 days of wait for even rejections. In 200 days, I'll read your response again and finally, experientially, know what you mean.
Yeah, there's a lot of markets that are really long like that, including many of the really good markets -- probably largely because of the volume of material they're inundated with.
FWIW, approx. 17% of my subs were out 100 days or over.
6% of my subs were out 200 days or over.
3.5% of my subs were out over a year.
My longest? 1826 days + 3 ignored queries on a solicited sub, then I withdrew it. (Don't ever wait that long.)
Overall, though, my average response time has been 75 days. If I exclude the 1826 days, it drops to 62.
Right now I've got one out at 526 days and one at 187 days, and counting.
I'm sure I'm failing at sounding sympathetic, even though I *am* -- each of those milestones when I first hit them felt ridiculously long, but in hindsight, with one notable exception, now seem fairly typical.