so Karen - it's hard to say how long because we are all different but there are ladies in their 60's on the forum who cannot give up their hrt without horrendous side effects coming back. Looking at my own issues I am 12 years in and possibly 2 years post meno but it is hard to tell when you start taking the hrt early. I started at 45 I think but it was PrepakC now discontinued and although it stopped the flushes it wasn't strong enough to deal with the anxiety, panic attacks, insomnia, crushing depression etc. It gave me heatburn and nausea because they were pills you had to take and I had all the issues that come with taking stuff orally if it doesn't agree with you and I took that for 9 years because I knew no better about what I needed do I just thought I had to live with it. Since I have been on the "right regime" well it is right for me my list of "issues" is right down from about 15 to 4.
I am 57 and I am going to take hrt for as long as I can. In fact I will do anything to carry on until I am in my 80's as the quality of my life has been so bad for so long and would be so bad without it, it just would not be worth living and now I am on the right stuff it is worth living! I NEVER want to be in a position of feeling like I have done (if you read my history untreated hormonal problems go way back to when I was a teenager). I know it sounds dramatic but I also know now there are a section of women out there for whom that is how it is! It took me 2.5 years after prempak to get my "right" hrt and 3 months for it to settle and another 3 for me to be able to say "my life is now worth living" There is NO WAY those words would ever have been written 6 months ago and I have struggled all my life, I wouldnt give up now. I knew if I wanted to stay alive I had to persist in finding the right regime for me.
For some of us it can be a very very long haul...not what you want to hear...but let me tell you for me the end results are worth it!