I found the secret one long ago, back when I first messaged you on itch.
I can't watch ads, so the others are moot.
I was just trying to find a reason for the quick training time.
Maybe i just got a whole bunch of achievements at the same time and didn't really notice. It is what it is. 1 minute max is too slow, I think. There are more options for increasing houses and their size than there are for training disciples, especially as disciples are spent as a currency.