My King and Queen need 7days for 1 level update and I can't use them in the upgrade time. it would be very awesome when I can use my King and Queen still when they are upgrading and when this is impossible to make because of the game balance just let us use our king and queen during the Clanwar just for attack because it's sometimes we can't get two stars or one star because we're upgrading the king or queen. And it would balance the game better because both clans can use their heros still when they upgrade them.
Heroes being usable in wars while upgrading has also been proposed and recieved a lot of support, show your support on that thread, supercell is likely looking into this as I heard that they support this idea also