FFX questions

[TheGame]

1. How long is this game???

I only have 4 hours on the game, and it feels like it just started (I'm pretty sure it did). I'm slow with RPGs... like, if there is a space between two save points where I do battle, I will go back and forth 5-10 times just to make sure everybody on my team is leveled up high enough to where Battles will never be life threatining. (and if I were to "lose" a member of my team, I would still be set)

2. How important is that sphere Grid?

I really don't know how to use it.. the directions in the game were probably clear, but back when I saw the tutorial, battles weren't the first thing on my mind.

3. Who thinks Lulu has a nice Rack?