Getting people back to work is always the number one objective.
Post-traumatic stress has a lot of focus on it, but let's start with something easier. For clinical depression, there are excellent outcomes. For post-traumatic stress, there are good outcomes over a longer period of time.
There's no written rule about this, but we tend to give people up to two years to get back or else they have to get into a different trade or perhaps leave the forces.
We've had many successes. If the right treatment and the right support are in place, the outcomes are excellent. As Mariane said a few minutes ago, what happens after the trauma is often a lot more important than what happened before. If we have all the things in place, the outcomes are excellent.
The terrible irony of this is that the longer you don't go for help, the harder it is to help you. We have a natural subculture of not being sissies and not going for help.