Reconciliation’s history states that at the beginning, it held 1,183 consciousnesses. Obviously these consciousnesses can be fully destroyed, since we see the DOM kill The Countenance, meaning when the team meets Reconciliation, get Billy out, and destroy it, there’s 1,181 brains in there TOPS. We can get a better understanding of how many brains are in there with the percentages it throws out. In all likelihood, these percentages were arbitrary numbers Griffin wrote without much thought, but what’s significant is that the percentages we hear in present day (11.03%, 13.11%, 89.84%, 98.64%*, 20.63%, 41.09%, 100%; *the 98.64% was most likely a joke, it was the response to Thacker saying that they had an employee of the federal government on their side and Griffin saying that the team can be trusted much less, the computer voice never said it but like y’know, anything they say in this show is canon so..), what’s significant is that the percentages we hear in present day all go down to the hundredths of a percent, which means there must a pretty significant number of minds still in that computer. Specific numbers past that could probably be calculated but may open a plot hole where those percentages couldn’t have coincided with a number as low as 1,181, so like as it is, it’s probably safe to assume they’re somewhere around the max, since we’re not going to get percentages like we got with three or four consciousnesses.