My experience is that when a scan is done, like MRI, the surgeon reviews it, and then it’s reviewed by anyone on your medical team who needs to discuss treatment options. Usually takes a minimum of 2 days, but it depends on how busy the surgical schedule is. Could be a week or more.

Here’s my timeline so you can compare how yours is going.
My local mammogram and follow up diagnostic and ultrasound were on April 21 & 29, 2022.
Radiology gave it a BIRADS 3 and said to come back in 6 months for another mammogram.
By June the uncertainty was bothering me. I talked with the radiologist 6/7 and they ordered a biopsy 6/10.
It came back DCIS intermediate grade, ER+PR+. This was all done in the Austin area.
I contacted MD Anderson on 6/17, and had an MRI and saw the surgical oncologist on 6/27-28.
There was some delay getting surgery scheduled to get all my records in place in the new location and facility. They offered a surgery date 8/15 - but I asked if I could change that because it meant traveling in for a Friday prep and surgery on Monday. I really didn’t want to have to hang around Houston for the weekend, besides the cost of a hotel.
Surgery was on 8/30.
Saw the radiation oncologist on 10/28 to plan tx, radiation was 10/17-10/21.
My understanding is that low grade DCIS takes about 9 years to grow from a cell to a lesion large enough to scan. Intermediate grade takes 6 years and high grade 4 years. Of course there are variables that affect that timeline. But I wasn’t too worried about waiting. My DCIS was under 2 cm at surgery, so it had not grown very fast.