You did not check it very well you would have seen the whole details of how to write and making money on-trendri as it is a simple thing to do.
I think the least worfcounts that you can make money with on here is 30 words. So from 30 words you can be credited but you should know that the pay will be very little compared to somebody writing more than hundred words.
So what this means is that you should always try to make your post as long as you can, you can make it up to 150 words if it is a thread you have 7500 credit but if it is a comment that you can make up 150 words then you can have 6 cents so there is no specific maximum word count you can write as much as you can because the more you write the more you earn.