Hi there! I'm with NUH and my first IUI cycle went like this:
CD2 - consultation and scan (was on a Sat)
CD12 - scan to check follicle size (about 1hr including waiting time. Scan was only like 10min)
CD14 - scan again for follicle size (about 1hr including waiting time, scan was 5min only, dr rushing!) Visited GP near my house for trigger shot (ovidrel) that evening.
CD16 - Tomorrow! Going in for my IUI
Not sure if kkivf waiting time is longer. Do take into consideration travelling time back to your office.
By the way, it should be vaginal scan and not ultrasound scan.
Hope it helps!