I've read the standard observation that most MTBIs resolve within 3 to 6 months. I've also heard 6 to 9 months.

But truly, each injury seems to be different, and the recovery time seems to depend on so many variables. I'm just past the 4-month mark and am doing a lot better, although it's been a very gradual process - I'm probably at about 75% of normal (up from about 25-30% post-injury). My symptoms are way down, although they're not gone yet.

Sidney Crosby was injured in January and is still not fully recovered, although his PCS symptoms have "mostly dissipated." That's 9 months and counting, and he just turned 24.

Someone I know had several concussions without PCS symptoms. Then she had another concussion and had significant symptoms that took over a year to go away. She was off work for close to two months, then had to work part-time for a year to help manage her symptoms.

There is no standard timeline for recovery. My experience has been that this injury requires unbelievable patience, but that it really pays to follow the advice of the informed doctors (rare as they are) and the experienced members of this site. I believe that in many cases, the brain will heal if given adequate time, rest, and environmental supports.