Scan length?

We have our 'anatomy scan' Monday morning. (We already know what both babies are but since this is the big measurement scan, we obviously are still having it lol) when we set up the ultrasound, I asked how long it would take, because my husband works seconds and I didn't know if he would need to drive seperate. The receptionist said  it won't take longer than 15/20 minutes, just like a singleton pregnancy.