Hi plumb,
this is a tough question because everyone is so different. I have experienced flares that would last for a few weeks at a time or even just a day, but this latest one has lasted months and I haven't a clue why it has suddenly gone so wrong. I am hoping to head to europe for a few months in the hopes that a change in climate will stop these in its tracks for awhile.
It is so easy to panic and start to freak out with lupus because everyone is just so different and it feels like you have no control, starting each morning crossing your fingers and hoping for the best!
I did get a brief break from this latest flare by going on holiday to the beach for a week and it was amazing what a difference that made. Now I am back into my routine with added drugs and its happening all over again.
Sorry I can't really help you with a straight answer but I can understand how it feels to be so uncertain.
Best of luck and take care