How many ORBs are left from the original (limited) supply?
Do you mean the pre-mine leftovers or what has to mined to the total supply limit?
The supply is unlimited. I got to this conclusion thru a series of brain eating calculations and empirical research and every combination of them. I tried to roast a cookie on an open fire and got a flaming demon out of pillar of smokes. The morale is that I expected a simple outcome but summoned an outlier.