There is no max # of confirmations.

When a tx is included in a block that is 1 confirmation.  When another block is added to the blockchain it is 2 confirmations.  Another block = 3 confirmations.

100 blocks later = 100 confirmations.
210,000 blocks later = 210,000 confirmations.

The number of confirmations simply indicates how "deep" the tx is inside the blockchain and thus how difficult it would be to reverse.

Just because 6 is considered "very hard to reverse" doesn't mean confirmations stop at 6.  As long as new blocks are added the blockchain the number of confirmations will increase. 

I am not sure what you are asking?