"So you think that God took 14 billion years to make the world, not just 6 days. Don't you believe God is powerful enough to do it quicker?"
I have heard young earthers ask old earthers such questions.
But I hope that no self-respecting old earther would imagine for a moment that God couldn't have done it in 6 literal days, 6 literal seconds or 6 literal picoseconds.
Similarly I hope that no self-respecting young-earther would for a moment imagine that God would have shown himself more glorious had he chosen to create in less time than six days, but somehow he didn't because he couldn't.
If one is going to take Genesis 1 literally, the strange thing is not that God takes such a short time to form and fill the whole world, but that he takes such a long time. After all, he is the one who creates time - he doesn't need it! His whole infinite life does not experience the passing of time at all.
Somehow, God is bringing more glory to himself by taking his time.
Old earthers would argue that God brings even more glory to himself by taking billions of years temporarily, just as he brings more glory to himself in creating ten billion times ten billion suns.