Final Fantasy XIV fans. In a move familiar to longtime Square-Enix players, the system was put into place without a great deal of description, with players left to speculate as to how the system worked. But a very uncharacteristic move comes from director Nobuaki Komoto with an open statement on what the system is, how it works, and what it's meant to do. Many answers are given, albeit not the answers that all players would want.
The short version is that for each class and character, you will get normal experience for eight hours, followed by a slow drop-off over the next seven hours that ends at no experience gain. This goes for both class levels and physical levels, which means that after 16 hours of play your character's physical level cannot advance further until a week has passed from the start of leveling. Komoto mentions the reasoning behind the system in the full letter, as well as the several ways that the team is working to adjust it. Although it's nice to have the system spelled out in full, "you can only level so much" won't sit well with a large part of Final Fantasy XIV's expected playerbase.