The duration of completing the "Vow of the Disciple" raid in "Destiny 2" can vary widely depending on several factors. Typically, the time it takes to complete this raid depends on the experience and coordination of the raid group, as well as familiarity with the raid mechanics.
For teams that are well-coordinated and experienced with the raid's mechanics, the Vow of the Disciple can typically be completed in about 1 to 2 hours. These groups often have strategies in place for each encounter and can efficiently manage the challenges presented by the raid.
For groups that are less experienced or doing the raid for the first time, it can take significantly longer. Learning the mechanics of each encounter and effectively communicating as a team can extend the raid duration. In these cases, it's not uncommon for the raid to take 3 to 4 hours as the team works through trial and error to understand the best approaches for defeating the bosses and solving puzzles.
New raiders or those leading less experienced teams should plan for a longer session to allow plenty of time for explanation, practice, and potential wipes as the group learns the raid. It's also helpful to watch guides or walkthroughs and discuss strategies before attempting the raid to reduce the learning curve and increase the chances of a successful completion.