King Agrippa asked if Paul could persuade him, in such a short time, to become what?

Answer: A Christian

Agrippa said, "Can you persuade me in such a short time to become a Christian?" (KJV: "Almost thou persuadest me").

“Then Agrippa said to Paul, “Can you persuade me in such a short time to become a Christian?””— Acts 26:28 (BSB)