Acts 1:3 (NLT)
3 During the forty days after he suffered and died, he appeared to the apostles from time to time, and he proved to them in many ways that he was actually alive. And he talked to them about the Kingdom of God.
After his resurrection, Jesus kept visiting. Not one day. Not three days. Almost 6 weeks. No mistake.
During this time, he talked to them about the Kingdom of God. Dialogue. Reassurance. Time together. Real time together.