Um, how long is pre-menopause suppose to last?
Your mileage will vary. Having been through it once all the way from 'what the hell?' to hystrorectomy with my ex-wife and more than several years with my (in the following order) friend, girlfriend, ex-girlfriend, friend. I can tell you that it can be all over the board. The Ex was diagnosed as premenopausal at 45 and had a hystrorectomy about 1.5 years later. The friend mentiioned above started hot flashes at 50 and is still fairly clockwork at 53 (still has hot flashes though). Current GF is looking forward to the "end of this bullshit", she is 44.
4 out of 5 of the womenfolk on my mother's side don't get hot flashes, don't get weird, they just peter out starting around 50 and then stop. The other 1/5 start petering out and either get quick hystrorectomies or go nuts. There seems to be no middle ground. By and large they are all lucky in one sense, I didn't even know that women got cramps until I had to spend time with my father's side of the family; took me forever to figure out what they were going on about ( I was either 14 or 15).
I like playing with fire.