For the people who are mentioning individuals who are getting full i110 in under 2 weeks, keep in mind that we're talking about a very small segment of players who are capitalizing on the weakness of the hunt system. Namely, that the system is defenseless against client side programs that can tell them when and where these NMs spawn. I have a feeling that if the system were working as Yoshi intended it to, this would not be happening, but because people were clamouring for unrestricted, open world end-game content, Yoshi is now dealing with the brave new world (or old world, depending on your view point) of open world content.

The most immediate solution would be to completely revamp it to a hunt system more like from FFXII, where you get a bill for a particular mark and then you follow a list of clues to hunt down said mark, with the entire affair acting in all respects equivalent to a levequest.