167,903
Assuming we would do 100 posts a day on average, we would need about 8321 days, or 20 something years.
But we were at one point capable of getting 300 a day on average, with that it'd cut the number in three, to around 2700 days or closer to 7.5 years (calculator too far, I'm just guessing the numbers
)
Now let's not include the first years of this thread in the average because they were very slow and we'd get something like 44 years if we assumed the average over all the posts made from number 1 till now