Like Fermat, I was Silver and just finished a 2 room 13-night stay. They automatically gave me Gold after those 26 nights even though the website had originally said that I would need 50. I didn't sign up for any fast track promotions or request special treatment. I guess they just figure that if you spend 26 nights by early February that there's a good chance you'll be staying with them a lot. Too bad my team has decided to switch from a Marriott to a Hilton.