premier pro timeline I need to edit some clips for part of my graduate research to 200ms.
200ms are equivalent to 0.2 seconds.

Does the picture show this as 0.2 seconds?
It looks like you have 25fps (25 frames per second) video, so each frame is 40ms long (1/25 second). That means 5 frames of video would be 200ms. Your image shows a 20 frame clip, so it's 800ms long.