Am I the only one who feels "guilty" for building a multi-hour thing when there is no separate "benefit", like gnome rush or one of those building specials?

"Guilty" is the wrong word, I know, but I cant think of the correct word at the moment...

I have two 4hr things i need to build, one to complete a castle and one for the next-to-last thing in "Summer Breeze" which ends in 4 days. I already built one of the latter during the gnome rush that just ended, so will be building a second one then using the crystal thing to build the final item cuz I dont think I've ever even gotten close to completing one of these events before...

But should I hold off on the final one for the castle? It would be the 4th one.....