This may come out the wrong way, but ... a few tips ... I'm not even in the campaign (i'm in a different one, with different rules) ... Do more than the minimum required in terms of post quality, in terms of minimum characters.
I personally do not see any sense in a lot of posts that are just less than 100 characters. You really need a couple of sentences to express your thoughts or ideas clearly. Bump posts are clearly made for only one purpose. "I agree" posts are useless, maybe there should just be a "Like" button but any little metric that gets added to this forum eventually gets gamed, or something.
As for the so called "time limit" ... the problem lies in users posting everything they can in 2 or 3 hours. If you really must treat this as a job to earn some money, then put in the hours like any other job, 10 hours a day or something = that means 1 post every 30 minutes while you are awake = 20 posts a day spread over 10 hours. High quality posts. Not random blabbering trolling posts, unless that's what you do in other threads (some people just do this, they aren't getting paid, and they're having fun or entertainment just trolling others.)
There are normal people out there working 16 hour days just to earn, working 2 jobs too.
I think the other problem is the maximum that the campaign pays out. If they just copied every other campaign that required only 20, 25 or 30 per week (I see the average is about 25 per week) then we wouldn't have all this spam and low quality junk.
The massiveness of the campaign also indicates its potential longevity. Too many posts. Too many users. Too much payments to too many people = short lived campaign. Controlled ones tend to last months or years.
This will probably last longer than the previous one.
Ok, I'll go back to lurking. Have a nice day!