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I've never quite followed things like this... wouldn't the cost ~double for 57 bits, and again for 58 bits, etc...? making +8 bits ~256x more expensive? Obviously not considering advances in compute over the decade... unless you were, in which case my point may be moot.
That was 56 bits in a week, so spend 32x more money and 8x more time and you can do 64 bits in 8 weeks. The power cost is << the equipment cost at that time scale. Factor in technology advances and it should go down to ~10x cost easily. SHA-1 team spent 8 weeks so...
(sorry for the previous deleted tweet, brain fart on a couple bits, I just woke up)
np... confused me for a sec when I couldn't reply
Ahh, yes... thanks! I didn't consider time / missed your "few weeks".
In that case, very interesting that their budget / cost was so large... 
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