About 5 DRK per day, at current difficulty.

Your GPU that normally hashes scrypt at 550 KH/s, will actually hash at around 1,500 KH/s for this algorithm.

You can then check here:
https://www2.coinmine.pl/drk/index.php?page=statistics&action=pool

And compare to other people. In your case, you would get around 1,500 KH/s.

I believe that is about correct.