No Pippy, I did not talk about recycling of the dunes. Even after seeing them a second time, there are some that I still did not manage to finish. Unless they recycle continuously untill all the elements are found, buying the outstanding items with rubies would be preferable than the lost for ever notice.
Gotta said that the scarcest items these days are power tokens and he is right. There is no guarantee that the one outstanding item you need to find, will be found with the very first search you do. I am not a statistician, but the odds are good that even in a four day window period, you will end up not tapping THE spot where it is.
It would make sense to me that a game that is on autopilot should have no cut off deadlines.