When did St Luke follow Jesus?

Luke has never physically followed Jesus, but he did follow Jesus in the same way that Christians today are called to follow Christ, that is, to follow his example of love and service for others, especially those that belong to Jesus Christ.

1Peter 2:21 - "For even hereunto were ye called: because Christ also suffered for us, leaving us an example, that ye should follow his steps"

John 13:34-35 - "A new commandment I give unto you, That ye love one another; as I have loved you, that ye also love one another. By this shall all men know that ye are my disciples, if ye have love one to another"

Luke therefore demonstrated, that he is a follower of Jesus by his love and care for the saints, particularly his assistance to the Apostle Paul, who at the time was in prison and abandoned by all.

2Timothy 4:10,11 - "For Demas hath forsaken me, having loved this present world, and is departed unto Thessalonica; Crescens to Galatia, Titus unto Dalmatia. Only Luke is with me"