84,796
This thread is disadvantaged, to the "get to page 9,000" in that page 9,000 is at reply #135,000 and this needs to get to reply #1,000,000. Yet at the same time it's more active and started earlier! So which thread will win?
This thread has gotten to reply #84796 in 2117 days, which makes it have 40.05 posts a day! This is about 12x more posts per day than the other thread. So this thread will get to a million in 22,851 days! Which means we'll get to a million in Monday, 3 January 2078. The 9,000 page thread will get to their mark at Saturday, 1 September 2125, so this thread is winning!