With Hell Week over and the Melanie phone call (whatever her motive) acting as catalyst, I'm optimistic that the Sage/Chad story may make significant headway next episode. If I had to take a guess, the episode will end with the MC about to head home for his birthday (i.e. the letter's content will remain unrevealed).
IRRC originally DPC wanted to make the episodes about a week each. Then he announced that he was splitting Hell Week into two episodes...and as we now know, it turned out to take 3 episodes! Let's hope he doesn't spend too much time devising various "Repair the mansion - carpentry, plumbing, painting" mini-games and concentrate on story progression this time around.