every one is different and I think it takes at least as much time that you were manic to recover.There is a kindling effect that weakens us.
bipolar is a forever diagnosis.
There will almost always be mood swings they just may be better control with medications.
I have heard of folks who don't take prescription meds and only take amino acids/supplements but my guess is that is far inbetween. And they have created a low stress level for their daily lives.
Even with treatment meds and therapy. Some folks continue to have mood episodes, mania or deep depression and suffer on a daily basis. Medication management is so difficult. It can be like a merry go round, trial and more trial. what works for one of us may be awful for the other. many of us have gained weight with the meds and this is alarming. The meds may work but the side effects are unacceptable.

It is very frustrating for a lot of folks.
some of us suffer with addictions others crippling anxiety, many lack of sleep, can't work or on disability. etc.
I wish you much luck with your Management of your bipolar.
eating well, getting good sleep, exercise and monitoring your stress level will help guide you to stability.
keep posting we are listening.
(((((HUGS))))
bizi