quote]
Hundreds of years.
Once you crack it you'll want to spend it, so you'll have to disclose the public key over the network.
Once everyone sees the public key and knows it has a 66-bit private key, they will crack the private key in
a few seconds at most and double spend, making your efforts completely futile.
So I guess the reward for ruining a lots of hardware and paying for the power goes straight to zero, since everyone will fight to double spend, making the fee higher and higher and the net profit going to zero.
[/quote]

So all the bitcoins that are from 66 bits to 160 bits have no financial value?