It is not hard to find a wallet(the bitcoin address) with enormous amount of money in it.
Its not hard to find a network with enormous amount of hashing power(any pool).
So my question is; How safe is it realy? How long time would it take for a big pool to break a singel address and can it be done?
Pretty much impossible. It would take many many lifetimes over. Don't believe me try it!
https://en.bitcoin.it/wiki/VanitygenHere I tried to brute force this address
https://blockchain.info/address/1FfmbHfnpaZjKFvyi1okTjJJusN455paPH better known as DPR's coins.

Epic. 7.2E23 years.