The number of manic episodes varies from person to person. That's the best answer I can think of. You might have a depressive episode next time, and I hope whatever you might have will be a long time from now. I am of the opinion that we are more likely to have episodes when we don't take meds. I encourage you to see a therapist. They can help with stress and help us monitor our moods. I have gone over four years so far without an episode.