The King should have faster regen time, as he almost always gets KO'ed if used in a raid. The AQ can stay out of danger and escape unharmed sometimes. But it should be capped at like an hour. Gets a little long at Level 30+.
Level 1 heroes used to take 60 minutes to regen and I was fine with that. They didn't even have abilities then and were pretty much useless, but I still managed. I just think people are getting a little bit greedy now.
I don't bother farming with my king so all I need to do is boost my AQ if she gets hurt. We are talking 10-20 gems a day. This is roughly the price of buying gum out of a gumball machine. Don't be stingy. SC has made a great game and deserves a bit of money every now and then.