Duration: 6:44

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Use Auto Play for faster clearing. For me one fight takes ~3min. This first fight took me 5min because i was using buffs, thinking, summoning, etc, so Auto Play it to the end ASAP.
Engage while timer are active, because bonus are applied at start, not at the end of battle.

Sometimes you get only crystals you need (eg. only blue), and sometimes random crystals: http://i.cubeupload.com/HBzVaY.png
I started with this: http://i.cubeupload.com/CGqgOI.png
Ended with this (could gain even more in 30min): http://i.cubeupload.com/C1Votp.png
OFC, you get other crystals too: http://i.cubeupload.com/ZlPjIs.png

Each battle gives you 2500 EXP, double it!

3 books for boost, each book cost 100 (all together 300):
-Double EXP
-Double Drop
-Double Gil

You need double drop, other things are optional, and for best efficiency you can buy a star for 250 (all 3 books in 1).

After you active a timer with a key, dont waste your time, win more battles as you can.

Daily crystal farm are limited to 10 fights, when you activate a key, its unlimited fights, but limited time (30min).