Board Thread:Questions and Answers/@comment-24776644-20140405031832/@comment-5927117-20140406194215

Takes 18h and most of the time you get nothing. When you do get something it's a small gem of any denomination. Since 6 types are very easy to get. Say you get something once in 3 tries and one in 4 it will be marginally useful. So once in 216 hours or 9 days for a small Onyx or Quartz.

Unless you've done all the other quests and got all the food you ever need I wouldn't bother.