About a min.
Most common two letters: do the two-letter word starting the 2nd sentence and the last word of the first sentence.
Once you have the last letter of the last word of the first sentence, you can tell what the word is.
Use that, to get word five of the first sentence.
Use that to get the first and second words of the first sentence.
Then things open up.
Yes, and Hal gives you those two letters. From there it just flows like butter.