Following Terry Cavanagh's presentation of different lengths of indie game development jam at World Of Love, the guys at The Game Collective have come up with a novel length of time for their fourth games pageant: the next decade. Entrants will have ten years to come up with a game for the pageant.
So, deadline is on July the 8th, 2020.
Which is long-term thinking in a way that I like. (Although I am forced to wonder how many of these games will be rushed to completion in the final few weeks...)