The case start date is the date the VA msc entered your info into the system to request the C/P exams, it is mostly irrelevant for the IDES process, the most important date concerning the "average va rating time" is the date found unfit.
That day or the next it goes to the VA for ratings, and even though all cases after Jul. or august last year were all digital, they still have a "15 day indoc" period built in but not counted.
They are not supposed to use the entire 15 days or whatever but they do, just instead of the old days where bob from the mail room would have to find, then hand carry a packet to the proper office (rating/appeal/education/death/housing benefits etc) now they use it to triage cases into at least 2-4 separate piles from what I can tell; 7 claims or less, 8 claims or more, all records included, records still needed. The ones they deem still need records/evidence go into a pile, the requests are sent out and if nothing is received within 30 days I believe they send out another notice, they then sit there for until either 60 days or records are received, if nothing is received, they will either rate or remand the associated conditions with what they have.
after that the claims are que'd for rating, This is the part of the process I am lost at and coincidentally currently stuck in. I fail to understand how a case can be purposely put into limbo, if the case is ready for advancement, assign it to a rater and press on, if it is not ready for advancement then leave it at the last destination office it was at. I've been told time and time again that they have everything they need for my case, but it has not yet been assigned to a rating official.
Review of evidence means it has been assigned to a rater and if they have everything they need to make a determination, then they will go ahead, if not it will go backwards. once the rater makes a decision it moves to prep for decision, then an in-house review, after the in-house review either the notification process starts OR it may be picke dup for a STAR review.
Sadly even with built in reviews/sign-offs at multiple points an internal investigation last year found 23% or more of cases rated incorrectly, so really at the end of the day, after 3-36 months wait, you still have a high probability of errors.