Within the next 500 to 1000 years. After that point we will almost certainly have spread out far enough that any obvious Great Filters aspects would if they were the main cause of the Filter likely be observable astronomically.
I suppose existential risk will be highest in the next 30-100 years, as I this is the most probable period for AGI to come into existence, and after 100 years or so, there will probably be at least a few space colonies (There are even two companies currently planning to mine asteroids).
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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