Quote Originally Posted by Hulan View Post
Server bloat. If they do not include a time-limit, it would be entirely possible for the entire FFXIV population to camp out in individual instances at the same time; and they would have to plan for that. Which is entirely impractical from a hardware perspective. You need something that limits the flow of players through instanced content or else the servers will explode under the strain.
WoW's instances don't have time limits, and they seem to do okay.