With a single Rx 480 8gb at 31.8 Mh/s (stock settings) on a personal computer I have made between 3.5-4.5 DNR per day over the past 72 hours. With a hashrate 20x higher then that somewhere between 70-90 DNR would be expected. Like I said though, it's a small sample size on my end and I may have been lucky. I would need to test with more GPUs to know for sure.