Submit an article on various article directory

I wrote one article for my end user and started submitting it in various article directories. But my question is if I submit one article at all article directories then will it be considered bad from Search Engine point of view. Will it be beneficial for my site? Is it considered as a duplicate content? Please suggest if there is any limit how many times I can use same article for submission.

Currently i am submitting to only 25 only that are high PR.