Not sure how many of you guys play final fantasy 14 but here is an exploit that I have found.
If you do a fishing levi where it requires you to fish at multiple locations you are able to use guardian's favor and stick to one spot for the 30min and get the extra exp.
The reason this is an exploit and not working as intended is because if you use guardian's favor on a normal monster kill quest and kill monsters not involved in the levi you do not get bonus exp.
so to sum it up
get fishing levi
use guardian's favor
fish in one spot for 20-25min *even after you are done with that location for the levi*
soak up the extra 20-50exp per catch