I do not think the devil has holidays or off days which he take rest. The devil works continually till he sees a person destroyed or his mission's accomplished. 

He neither gives up or stop till he has cause hovoc in the life of people. He walks about,  always looking for whom to devour. 

>Be sober, be vigilant; because your adversary the devil, as a roaring lion, walks about, seeking whom he may devour: 1 Peter 5:8

https://cdn.pixabay.com/photo/2017/12/11/15/34/lion-3012515__480.jpg[Source](https://cdn.pixabay.com/photo/2017/12/11/15/34/lion-3012515__480.jpg) 
The devil is always working twenty four hours days without rest just to see the downfall of people. I believe this is one of his great secrets to winning his battles. 

The story of Satan managed to destroy Job shows us his relentless nature of  and his never giving up spirit. 

>Again there was a day when the sons of God came to present themselves before the LORD, and Satan came also among them to present himself before the LORD. And the LORD said unto Satan, From where come you? And Satan answered the LORD, and said, From going to and fro on the earth, and from walking up and down on it. Job 2:1-3

Satan would not back off for any reason and would not just stop pushing harder even if things seems impossible and a situation looks insurmountable. This is is not to say that nothing can't stop him, he can be resisted and can be stopped but he would not just accept failure. 

Christians should be aware with this character and must positioned themselves well before they can win their battles against this foe. 

Things that make us stand firm and win battles against Satan shouldn't be taken lightly. We should not joke with things that gives us so much power and make us so strong for we are not dealing with just an ordinary folk. 

Just like the devil is persistent so must we also be persistent when it comes to practising spiritual things like prayer. Nothing should make us give up on prayer till the Lord answers and show himself strong on our behalf. 

Our attitude should be that of the poor widow that Jesus spoke about in Luke 18:

And he spoke a parable unto them to this end, that men ought always to pray, and not to faint;  Saying, There was in a city a judge, who feared not God, neither regarded man:  And there was a widow in that city; and she came unto him, saying, Avenge me of my adversary.  And he would not for awhile: but afterward he said within himself, Though I fear not God, nor regard man;  Yet because this widow troubles me, I will avenge her, lest by her continual coming she wearies me.  And the Lord said, Hear what the unjust judge said.  And shall not God avenge his own elect, who cry day and night unto him, though he bears long with them?  I tell you that he will avenge them speedily. Nevertheless when the Son of man comes, shall he find faith on the earth? Luke 18:1-8

We should never for Joke with important matters.