Hm.. to achieve 20,000 posts ( to be radioactive ), your post count ( 85 .. as of this response ) would mean you have 19915 posts to make before achieving your goal.
At your current post rate of .095 per day, that should be 209631 days before reaching this goal.
Or.. about 574 years.
At 15 seconds a post, the fastest you could accomplish your goal would be 83 hours... not counting downtime due to banstick for spamming.
I'd say 'good luck' in achieving your goal, but knowing the quality of the posts necessary would probably be lacking, somewhat, in cranial stimulation content, I won't.