Well, it all depends on the strength of paperwork you submitted. Until they give you an answer, don’t negotiate against yourself. Furthermore, you can add “unsolicited evidence”, if you feel you would do things differently next time you apply, submit an addendum as unsolicited evidence.
myself, when I applied for 3 people on Jan 10th, 2 got confirm notices on Jan 12…I had to wait until February 13 for the 3rd one. When I called I was told to wait.