Quote from Phunkie;106141:
NX item?
Obviously XDDD
But nonetheless... if you took a closer look at the potion itself, it should say "COMBAT" potion, meaning that missions and quests will not count (not sure, but that should also be stated in the item itself)
It's really useless to use x2 potions in SMs... Not only are there a lot of moving around (which can cut down the time you could be killing monsters), but IMO, the mob spawn is really not worth it. I suggest dungeons where you can easily move on to the next room with predictable mobs
FYI for you: Even after you d/c or log out, the x2 potion's effect will still be there!! If you used a 2 hour potion for 90 minutes and log off, the next time you come back on, you'll have x2 exp for 30 minutes, cool huh?