castle nathria and sanctum of domination took ~2 months from the first ally kill to the 100th ally kill (its approximately), castle took 2 months and 4 days and sanctum took 1 month and 2 weeks..
but looking right now on sepulcher, after 1 month and 4 days, theres only 9 kills on jailer, and no where to see at least 50 kills soon enough..
theres a small chance we dont even see a 100th kill before dragonflight release
maybe its the first time it will happen?
well, at the time, i dont know if blizzard will ever put more nerfs to help ally players