Rewards are not confirmed until 120 new blocks have been generated. Bitcoin tries to generate a block on average every 10 minutes, but that varies. You can look at the stats page to see how many blocks remain for each reward.
Hi everyone, I'm a new mem of http://mining.bitcoin.cz and i wonder how long does system take to change Unconfirmed reward to Confirmed reward??? Sorry if stupid question because this theard take 111 page so I can't read all of post Thanks so much.