4 weeks wait for mammogram

Hello -:) 

I hope you all are well and healthy!

May I please ask if someone has a similar experience. 

Last July I had a mammogram and the readilogist detected a lump and I was seen by a doc on the same day to arrange biopsy. I had to have a lump removed and radiotherapy later.

Today I had my 1st follow up mammogram ( a year later ) and I have been told that the results will be ready in 4 weeks.  

Is that something common as I was expected to get the results today? 

Thank you so much! 

Warmest wishes and gratitude,