When Assembling Parties in an FF game......

[Reverof Enola]

So you try to use all of the characters instead of just sticking to three?

Yes.

But that will take forevvvvvvvvvvvvvvvvvvveeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrrrrr. Unless the characters level up when they are not in your party then I understand.