Very curious about the final answer and about the difficulty of the last one... is there an end date? like one year or something?
I think there is no end date.
But unless OP decides to pull out (as it has happened before - I saw such cases on reddit) I think it'll be solved pretty quickly, as you can see there are at least several groups of people trying to decode it and probably many other such groups are hidden, there is a lot of money to be won so expect fierce competition.