I think there is a problem with the minig. I have so many friends who started mining BTC3 too but after several hours no one could find 1 block, even those using powerful CPUs.
Mining takes a lot of patience, it does not find blocks whenever you want to. It will depend on lot of other factors as well. It could take seconds or hours or even days or even longer for a single computer to get lucky and find a block especially if there is a lot of competition.
Thank you