Final Fantasy XI's Adventuring Fellows have always been an excellent idea, some of the implementation hasn't been quite as strong. A combination of a short summon time and strict limitations on where your fellow can be active have always hampered the system. The next update for the game is aimed at addressing several of these issues, however, giving players more reasons to call a fellow out and more opportunities to do so throughout the world.
Active duration for fellows has been doubled across the board, with new fellows staying for 90 minutes and increasing to 180 minutes at maximum bond. The number of enemies that can be engaged has been increased even more significantly; your fellow will initially engage 50 enemies before departing, rising to 100 enemies at the apex. Combine that with several new areas for Final Fantasy XI players to call their backup NPC, and there's the hope that your fellow will be less of an occasional buff and more of a near-constant companion.