No one, regardless of education, experience, or both could give you definite answers to the questions you've asked. He might never have another mania - or mania might be recurring for him. Hopefully, medication will ameliorate episodes. Generally, meds make the time between episodes less frequent and less intense. So, the idea of meds is to increase stability.
My son-in-law had a psychotic manic break 15 years ago and was dx'ed with BD1. He was in hospital for six weeks. When he came out he stopped taking meds. Thus far, he has not had a full-blown episode again. But he's very reactivate to every little thing and he has occasional rage episodes. He self-medicates with ZZZQuil every single night so he'll sleep. He has a good job. According to him he's "cured." Pfffft. What I see is that he's 1/4 inch from having a serious episode, sooner or later.
Bipolar Disorder cannot be cured, but it can be managed, which is what medication is for.
Too often, bipolars feel better, think, "I'm okay now", stop meds. Big mistake, and one that many of us with BD make.
So, yeah...meds and therapy are key.
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