If any of your party members have the magic spell Speed Up you can continuously use it to make them gain a lot of experience so they can level up faster, and have their next turn come quicker. Using Speed Up also raises the chances of allowing you to use your character's hidden abilities so it's a pretty good win-win situation. Also if you don't have the ability Speed Up, you can go to the first store in the game and it will cost you only 1,000 to purchase it.