Are there any denominations that teach exactly how long one needs to pray (and fast) before attempting a difficult exorcism, in light of Mark 9:29?

GotQuestions.org has an article entitled [*Why did Jesus say that the demon could only come out by prayer and fasting (Mark 9:29)?*](https://www.gotquestions.org/only-come-out-by-prayer-and-fasting.html) , which I’d like to quote to motivate this question: > Later, the disciples privately asked Jesus why they could not cast out the unclean spirit (Mark > 9:28), and Jesus replied that this particular kind could only come out > “by prayer and fasting” (Mark 9:29, KJV). It is only the King James > Version (and NKJV) that records Jesus saying the demon could only come > out by prayer and fasting. Other translations (ASV, NASB, ESV, NIV, et > al.) leave out *and fasting* and only mention prayer. The difference is > due to a textual variant. The two oldest and most reliable Greek > manuscripts omit *and fasting*. > > While there are many variants in the Greek manuscripts of the New > Testament, it is remarkable that none of the variants create any > significant doctrinal challenge—they are usually minor and don’t > impact the message of a passage at all. Mark 9:29 is one of the more > significant variants, as the differing translations make it unclear > whether the demon in Mark 9 could only come out by prayer and fasting, > or whether prayer alone would work. It is worth noting that in the New > Testament fasting was simply prayer so focused and intense that a > person did not give attention to things like eating or drinking—so > either way, Jesus is emphasizing that the demon in Mark 9 could only > come out by intensive prayer. > > As Jesus explains to the crowd, the key was the faith of those > involved (e.g., Mark 9:19, 23). So it is evident that prayer rooted in > faith in Jesus Christ is effective (see James’ assertion that the > prayer of a righteous [believing] person is effective, James 5:16b). > Jesus was challenging the crowd, the boy’s father, and the disciples > on the importance of believing in Him as the One who could accomplish > what would otherwise be impossible. Whether one accepts the *prayer and fasting* variant or the *prayer only* variant, it is clear that, in either case, a special kind or a higher degree of prayer is required before attempting difficult exorcisms. Unfortunately, Jesus’s recorded words are quite vague on this point, as He does not provide a more precise protocol, leaving several questions unanswered, such as: - How can one determine if an exorcism will be particularly difficult? - What factors contribute to the difficulty of an exorcism? - How much time should be devoted to prayer in preparation for a difficult exorcism? - Is fasting ever necessary, at least in extreme cases, and if so, for how long? Or is prayer alone always sufficient? Are there any Christian denominations or traditions that teach a more detailed protocol for preparing for difficult exorcisms?