Shitpost inflicts damage for 2-3 turns. While the user is using Shitpost, it cannot use any other attacks. PP is deducted only on the turn Shitpost is called; it will not be deducted for the amount of turns Shitpost is used before it is finished. After Shitpost is finished, the user becomes confused.
If the Shitpost duration is disrupted (such as by full paralysis, sleep, hurting itself due to confusion, or the target using Protect), it will immediately end. If a disruption occurs on what would have been the final, confusion-inducing turn of Shitpost, the user will always become confused.