ITT: people think mining 6 1-minute blocks in a row is as difficult as mining 6 10-hours blocks in a row
Unless I missed something, then that's correct, but only if you interpret it in a certain way.
With the same relative hashpower vs. the rest of the network, over the same # of blocks, chances of finding X blocks in a row are the same, doesn't matter if avg. time/block is 10 seconds or 10 days.
But... wouldn't a theoretical attacker care more about how much time it takes to get a successful double-spend instead of how many blocks?
Yup. Faster blocks mean more attempts can be made, and thus the less secure the chain is.