Well, I can tell you I've had a lot of periods where I thought I was "ok" but when I look back I can safely say I wasn't. There has always been something going on. But I've never been "normal" so how could I know? Bipolar is just like other illness. Good days, bad days, and okay days. I agree with the mood tracker and now I'm doing that anxiety tracker too. If anything maybe it can help me pin point my triggers.
Hmmm,,kind of scary to me that you say this,,because I'm thinking that I was mis-diagnosed and have been on no meds for a while. I'm doing great, not too high,,not too low,,,taking the ups and downs okay,,,
This is the time when bipolar disorder is a liar and tells people "shhh c'mere, I have a secret to tell you... *whisper in ear* yer all ok now forever so stop taking your medicine"
Yes there is a period of stability (technically euthymic) between episodes of mania and depression. As for when it will occur again if you are not on medication probably at the same rate it did before you were on it but it can vary. Best to keep a mood tracker and as well see if any of the things you did or behavioral patterns you had when you were manic or depressed start to re-emerge.