It is very hard to determine at what length it will take the brain to heal, each one of us is different. Did he have any other medical conditions? How old is he? I am 62 had very little problems after clipping however my annie did not rupture prior to sugery. Just remember that the brain takes time to heal and as it does hopefully he will regain all of his prior memories. Please read and print the letter from your brain, it helped me and my family. Nancy