20 week detailed scan

Hi mummies, im having my 20week detailed scan on coming monday. Would like to ask how does it work? I go into the room for the ultrasound, would my hubby be allowed into the room as well? Heard that itll take a long time. After that ive another appointment with my gynae and the timing diff is only 15mins? Scan at 1030 and doc appt at 1045... so im quite confuse if its just a regular scan or a detailed one...