A long time!
When I was 15 (about 52 years ago), I was in a serious auto accident with my mom and was in a coma for about 2 weeks, and they sent me home after I woke up. I had some brain damage, and ended up with tinnitus, left temporal lobe epilepsy, and migraines.
Getting a migraine diagnosis
Back then, they didn't do much for any of those things, and I wasn't treated for any of it. In fact, they missed all of my symptoms until I was 30 when a nurse friend of mine noticed by "staring." All those years my parents never listened to how my head was hurting, because we weren't "allowed to complain."
So, now I'm 67, being cared for by a neurologist I trust, and migraines don't come as often.
Have you shared your migraine story with us yet?