I have been a fan of the American Express Centurion Lounge network since I received the American Express Platinum card a couple of years ago. During my travels, I have been fortunate enough to visit the lounges in Dallas, Houston, Miami, and San Francisco. The Dallas lounge has moved to a new and improved location since I last visited. The Houston Centurion Lounge remains my favorite, so far, thanks to Tripp, Willie, Brian, and the rest of the staff.
The lounges tend to experience overcrowding. This occurs regardless of the time of day. American Express has formulated a plan to reduce the amount of guests over staying their welcome. Beginning March 22, 2019, American Express Centurion Lounges will introduce a three-hour time limit for same day departing passengers. The time limit will not be imposed on transiting passengers when proof of the inbound and outbound boarding passes can be provided. Passengers will no longer have access to the lounges upon arrival.
American Express Platinum and Centurion cardholders can continue to bring in two additional guests.
I think the three-hour time cap is a great thing. The lack of available seats in the lounges can be frustrating. Unlike the Alaska Airlines Lounge in LAX, Centurion lounges are usually always at capacity. This change should not be a big deal to arriving guests, as they will leave the airport shortly. However, I can understand the need for an espresso martini after a long flight.