I am not sure this would be long enough. It may be a good start, but I would say you probably need to have additional words at the end of the the above.
The actual length I used for my brainwallet is longer but not much longer (again I will state that this address was created over 2 years ago and has not been hacked).
Am sure there are some now trying to crack my address but that's okay - this is the experiment I am doing.