L1 Individual Drop BOX Chennai

My daughter had L1 Drop box on 10th January 2023, Tuesday, at Chennai as she has B1 visa valid.

Status changed Application received on 14th.
After that no change till today 25th Jan.

What is the normal processing time for L1 Individual application.

Also is there fixed time of the day, at which we can check the CEAC website for Visa status update? Else is it random checks through out the day to know visa status update?