1 block doesnt take long to confirm as valid.. 120 do, since generally one wouldnt expect to generate 120 blocks within a few seconds
120? i'm not sure what you are saying. afraid i'm misunderstanding something.
The blocks are a chain. The more blocks you go down a chain the less risk there is that its an invalid fork. So if a block has 120 confirmations, 120 blocks following it, then you can safely assume that your not paying out on an orphaned block or chain. I think.
Sam