It depends on each individual. Some people only have one manic with or without psychotic episode in their life time while people (like me) become manic (and always psychotic due to being schizoaffective) four or more times a year. It can be difficult to control manic/psychotic episodes, but the best thing you can do is prevent them. Usually the best prevention is taking your meds regularly (even if you haven't had symptoms in a while) and removing stressful stimuli in your life such as a toxic person, stressful habits, perhaps change career/job if it's causing a lot of stress or take on less hours.

Every person is different and your triggers may be different than other people's. In time you will hopefully learn what triggers you the most and learn to prevent them from escalating or you may never have another manic/psychotic episode.