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I am a rapid cycling bipolar and I have had manics that have lasted minutes and a couple that have lasted for months. There is no way to know how long any one person's episode will last unless you chart your moods for a year or more and can see a pattern -- then you can kind of do an educated guess sort of thing.

My suggestion to you would be to make an appointment to see a psychiatrist if you think you might be bipolar....also it's a good idea to get a physical done from your regular doc since some physical ailments can mimic bipolar disorder.