How much money spend for build castle level 19 from castle level 1?

Castle from level 1 to level 19 can be from free, $0 to $396 dollars, buying the corresponding 4 x $99 offers.

Or you can do the game process of getting there.

You can get to level 19 as fast as 8-10 days without spending any money, just do buildings you need to upgrade only the castle.

To then, upgrade