12 minutes per hour is 20% a day that goes for the dev.
LOL, just use awesomeMiner which is free to use. It has all the bells and whistles + many more features.
Seeing as i get 12 Min every 12 Hours
Check your math..
12*60 = 720 Min for you
SO
Add 12 Min to that
720 + 12 = 732
Now divide 12 by 732 = 0.0163924426229508
So what is my percentage?
1.63924426229508% which will be reduced as more people use the miner.