【FGO】 Ibaraki Douji 3BP Stall Farming. The Demonic Capital Rashoumon 6M raid

Battle Start at 1:11 Last turn 9:29
DISCLAIMER: This method is not perfect, it will no guarantee you will endure 15 turns the 100% of the time, because RNG is a part of the game things can get pretty nasty some times; and is just a low cost-low investment run, is not close to be the optimal stall setup .
My team in this case was specialized in survivality and low cost, this is a minimum to endure the quest and deal some DMG, but you should try slighly diferent setups to increase your damage using 1 or 2 damage focused servants or waver as a support alternative because he grants a lot of utility, and also since the class of the hands change every 2 days the efficiency of some servants will vary during the event, so you will need to reestructure some components of the team, do what works best for you.
This run was made using a 50/50 setup between damage CEs and drop CEs, you can always maximize DMG or drop using a diferent CE setup.
Also from a damage point of view, 1M raid has a better DMG/BP output if you cant pass the 1.5M DMG dealt in the 6M raid, so dont be afraid to do 1M until you have enough event CEs to do 6M. From a drop POV 6M is almost always better than 1M.
As a last metion, dont forget to enjoy the event!