I had never heard the term 'flare' until I became a member here, my Doctors referred to it as a 'pain cycle' instead, but there is more involved than pain, I think. There is no specific length of time, no specific way of breaking them, or lessening them other than NOT overdoing it, and babying yourself! That said too much laying around is no good either, it just causes the body more problems.
Reversing the trigger is the best way to get back to the non-flare state of being, there is research in the above links of this particular discussion. Though lengthy and in lofty medical terms, it is living purely, as far as proper foods, rest, NO STRESS... You know the difficult stuff! Some have discovered food allergies, and eliminated wheat, sugar, caffeine, dairy,cleaning products, artificial scents, getting rid of things that produce 'off gasing' like paints, rugs, and vinyl, florescent lights... We're still waiting to meet someone who has flipped the switch on the gene which returns us to normal.
Genetics is such a factor, though most know what set their autoimmune into motion (car accident, severe stress, loss, PTSD...) my Rheumatologist insists it is genetic, all inherited in one way or another, so we were all predisposed, all that was needed was something to set it in motion.
There is gene/stem cell research taking place, looking for a cure. That is where the true hope lies. we are always on the lookout for the latest news.
Stay strong, and take good care of yourself. Good to hear from you!
Wishing you well,