Yes, everyone's timeline is different. Even with just one trauma, the problem here is this. As adults your life is full of little traumas... this is besides PTSD and a known fact. When you have PTSD it manifests every and any little trauma you have had in your life, now it throws it back in your face 10 fold all because of what this disorder does to your brain. The undealt emotion was always present in your brain, problem is now though that PTSD manifest negative emotion and smacks you hard with it. This is what the problem is.
You think you have one trauma, one problem to solve, suddenly when really pushed hard to face and deal with that trauma, all these other smaller traumas come to light because your brain must rid them all now as PTSD HAS manifested them whether you like it or not. You must now heal not only the traumatic occurance that gave you PTSD, but now you must heal EVERY bit of past trauma in your life. This is where every single person falls down... even one trauma by itself often takes 3 - 6 months of time. More doesn't increase that time frame necessarily, as when you take on the worst trauma first you tend to knock out many at once.... just some that don't get tackled at once haunt you for a little longer.
Regardless of the life trauma requiring dealing with, your brain cannot hit trauma realistically, it cannot process the emotion in one week, one day, a specific time. In one session you may learn 10 things and be able to apply them, in 10 sessions you may learn one thing that takes you two months to learn how to apply and work within yourself and daily life. That is trauma therapy 101. Fun stuff, not.
It is the hardest thing you will likely do in your life... it is harder than living the trauma in the first place, so if you use that experience as a gauge, then double it, you may have some idea just how bad its going to get for you. Scary.... YES.... but absolutely worth taking 6 - 12 months of your life off and just work like hell on facing every major aspect of your trauma, so you go down as low as you can go, then you WILL come back up and be a whole lot better for it. Nothing from then on forward will be as bad as the initial trauma therapy blow.
CBT performed correctly will achieve this, EMDR will achieve it, other types of therapy will achieve it; there is no one way.... but the facts remain that when you start becoming ill it is quite normal and you must push forward regardless how crap you feel and want to throw yourself off a building, welcome to trauma therapy is the answer when you feel that way.... get used to it for the next 3 - 6 months of your life.