I'm not sure whether you're looking for academic research, personal stories, or something inbetween, but I can provide one anecdotal data point.
I was in a long-term relationship with someone diagnosed with (among other things) schizoaffective disorder, starting when we were both in our early twenties, and we're still, sporadically, in touch. Our relationship was affected by her condition in many ways, but ended for reasons unconnected with it.
She continues to be affected by mental health issues about twenty years after first being diagnosed, but during that time has developed and refined her own coping strategies, and the last time I heard from her (about a year ago), both she and her (adorable) daughter were doing well.
It may interest you to know that she is also obsessed with bees.
A tangent: my second-hand experience has led me to be suspicious of labels like
"schizoaffective disorder". Health professionals in this area seem to be a lot better at coming up with impressive-sounding names for the experiences and behaviours of people outside the mainstream of "normal" brain function than they are at actually providing tangible assistance ... your mileage, of course, may vary.
Having a good network of friends and family, on the other hand, can work wonders :-)