Answer:the sleeper eftect
Explanation:
When someone is initially not persuaded by the given message at first but over time they begin to get persuaded by the message , the delayed persuasion effect on someone is known as the sleeper effect.
Usually this occurs because a person don't really trust the source where the persuasion information comes from may be the reason they take time before they can believe the message .
This can be seen when politician try to convince or persuade people to vote for their parties it takes time for most people to actual be persuaded by their message.