It is kind of like the criteria for ratings when they rate your disabilities they go off of C & P exams. Try website called military disability made easy and click find my condition that may help give you some idea.
Not sure about the others but w mental health MDD it is possible even if it is TDRL. I would look at CP exams and compare to VAARSD to see where you might fall. Its really to little info to provide any solid answer.
I have seen people with 40 plus claims processed 2-3 weeks and some with 10 take over a month. I think it just depends on who is working the claims the workload of that regional va office etc, etc. All you can really do is hope you get through as fast as possible just hard to gauge.