After some research, I have a bunch of time stamps for scat scenes in the first 10 episodes of Night Shift Nurses. There are probably more, but here is what I got.

Ep. 1
None

Ep. 2
23:41-27:11

Ep. 3
24:00:28:42

Ep. 4
21:00-24:00
25:00-30:00

Ep. 5
15:30:20:00

Ep. 6
5:00-12:00
14:00-16:45
23:25-26:15

Ep. 7
4:00-5:30

Ep. 8
4:50-5:45
9:15-13:45
19:30-20:00
23:20-26:05

Ep. 9
None

Ep. 10
None

Again, I may have missed some. This is all from the HentaiHaven version of Night Shift Nurse, enjoy!