Change Puzzle Explanations

So I've been playing puzzles for a while as most people have who like chess I imagine, and you'll notice that some of the time you won't get a checkmate, you'll just get a position that looks like it's easy to get into a checkmate. And at that point it'll just move on. So I was curious about one of the problems that seemed like it would be very simple to get a checkmate on because I was cornering the king with 2 rooks, but I'm pretty good with 2 rooks and endgames and I couldn't find an easy checkmate after the fact. So I thought I'd let the computer explain to me how to checkmate from this position right? It took the computer 24 moves to checkmate after the position had been reached. 

Now I'm no expert, but if something takes 24 moves to end the game, it's not really a "obvious checkmate" now is it? More than half my games end in less than 24 moves, so there needs to be some revision done with problems like this.