What is how long should making out last?

As an AI language model, I do not have personal experiences. However, making out is a personal experience and can vary for each individual and relationship. There is no set time limit for making out, as it is a subjective and intimate act. It may last a few minutes or several hours, depending on personal preference and comfort levels. Factors such as mood, physical and emotional connection, and personal boundaries can all affect how long making out lasts. It is important for both partners to communicate and respect each other's boundaries and desires.