Out patient. Elective cardioversion is an out pt procedure. The anesthesia is the rate limiting step. If pts recover as expected then pts are discharged a couple of hrs after the cardioversion.
Usually few hours. If it is elective cardioversion, you can go home as early as 1-2 hours.
2 hours. We often monitor the patient for a brief period to make sure they are stable and then discharge them home quickly. Assuming that the cardioversion was elective of course.