Luke records the Devil’s temptation of Jesus in chapter 4, verses 1 – 13. He ends the story with the words, “And when the devil had ended every temptation, he departed from him until an opportune time.” The word translated as “opportune time” is chairos.
The Devil does not make a personal appearance again in Luke until chapter 22. He is mentioned in other places in the Gospel (e.g., “And ought not this woman, a daughter of Abraham whom Satan bound for eighteen years, be loosed from this bond on the Sabbath day?” Luke 13:16); but he is not a direct, present actor until he enters Judas:
3 Then Satan entered into Judas called Iscariot, who was of the number of the twelve.
4 He went away and conferred with the chief priests and officers how he might betray him to them.
5 And they were glad, and agreed to give him money.
6 So he consented and sought an opportunity to betray him to them in the absence of a crowd.
Luke 22:3-6. The word translated “opportunity” is the Greek word eu-chairos, a “good time”. In Luke’s construction, Satan has been busy looking for a opportune time to go after Jesus. Upon entering Judas he continued to seek for an opportune time.
When we read Peter’s description of the Devil (1 Peter 5:8), we see what the Devil was busy doing between chapters 4 & 22:
Be sober-minded; be watchful. Your adversary the devil prowls around like a roaring lion, seeking someone to devour.
Peter’s instruction, was the precise same instruction which Jesus had given to Peter, when the Devil in Judas (see also, John 13:27) was coming for Jesus:
Watch and pray that you may not enter into temptation. The spirit indeed is willing, but the flesh is weak.”
Mark 14: 38