Mine might be milder than some people I have heard of. Though I wish it wasn't there at all, and convincing myself that it's "mild" during a flare-up is hard work!
I get "phases" of it. I can go weeks with no symptoms at all, then suddenly get a horrible flare. Those can last anywhere from 1 day, to on-and-off for a month. Then I'll be fine again, and maybe even fine for anything up to 6 weeks or so!
During my "okay" times, I have normal bm's and can eat anything really, though I always eat healthy foods. But things that upset me during a flare are fine again to eat and enjoy.
I don 't get much in the way of pain, and even frequent bm's with IBS-D are maximum 4 a day. It's horrible when it happens, makes me so exhausted and shaky, but I always think of those much worse off than myself.