I live in CA. When a Dr. reports my hubby has dementia, how long does the DMV take to contact him?

It has been 4 weeks since my husband's dr. has said he would report that he has dementia, which is required by law. The first dr. had not reported and finally agreed to do so last week. If both report, or either, for that matter, how long can I expect the DMV process to take? After the initial report of the diagnosis of dementia, when will the DMV send the letter to my husband with forms to fill out? Four weeks seems like a very long time for my husband or the public to be in jeopardy from a demented driver. I was advised not to get involved and be the focus of his anger about losing this privilege. Do you have a timeline for me? Should I contact the dr. again? Thank you.