The chance that anyone could break AES other then perhaps NSA is near zero.
If is can be broken a lot of large companies and government agencies are in a world of hurt as it is the current gold standard.
Now as far as brute forcing my pass-phase good luck as a brute force attack would take 1.44 hundred trillion trillion centuries guessing at an attack speed of 100 trillions guesses a second.
Now also you should know better as far as getting my keys from memory as I do not used sleep mode and I do not shut the computer down within seconds of it parting company with it.
Oh evil maid attacks are made harder by setting the AT disk lock also.
Thinking of adding hardware such as a keylogger to my netbook? I happen to know it weight to 1/100 of an ounce.
Yes this in all more for amusement then to deal with a CIA level of attack as my worse risk model is having someone with good computer skills stealing my computer and wishing to do a search of my computer hard drive with standard forensics tools looking for information they could used to access my accounts.