Yes, that's how long it would have taken if the universe had formed naturally and had always functioned exactly as it does now. But why should you believe this?
I guess Jesus didn't really turn the bread and wine into his flesh and blood but just put it that way.
You guess wrong. Then again, you reject the New Testament, so why would you guess right?
Science (a gift from G-d) strongly suggests that stuff like that just doesn't happen. If the laws of nature are so absolute that they governed the formation of the universe, they certainly govern how it functions.
Then again, you reject the New Testament in toto.