[Finger] All Races Experience point bonus: +50%
Maximum duration: 720 min.
Maximum bonus: 15000 LV 1 WAR MNK WHM BLM RDM THF PLD DRK BST BRD RNG SAM NIN DRG SMN BLU COR PUP DNC SCH GEO RUN <7/7 4/[00:15:0, 5]>
One of the best items in the game I use it in every party and it has probably gained me many an extra level.
To get a double charge wait till it is on 1 charge use it and trade it for a recharge it will be ready to go straight away that way you can get two charges sort of for one party.
you can get 3 charges in one day if you can't use it every day.
16hours before you plan on exp'ing, use a charge, then log off. it will still be in effect for 3 hours of in-game time.
when you log in, join a party, use up that charge, then put it back on and use it again.
by the time it wears off again, if it's now at 0, go get it recharged and use it again.
3000 bonus exp is pretty good at low levels.