What if someone wrote a program that had a centralized network that would distribute passwords ranges to bruteforce? How long would that take I wonder with the current number of bitcoins users.
assuming the same as above (15 trillion encryptions per second) and a 20 character (truecrypt's recommended minimum length) password selected from ASCII printable characters (a-z, A-Z, 0-9, and all symbols), it would take
(94^20/15.5 trillion)/2=2.97*10^18 years
or shortly after the entirety of this galaxy is either thrown from it or engulfed by the huge black hole in the middle.