The planned times are published
.
No, they are NOT...They are "advised".
The inspections require six minutes.
The actual time is flexible (within reason) and is coordinated with the watch manager in advance to avoid/reduce disruption
The "Inspection" can take up to 20 mins......
To avoid "disruption"...Try talking to [ex] MACC ATCOS who have to hold the traffic miles away, especially when the Holds are full
The last "proper" Ops 3s left eons ago. The only one with any sense is R**, and he is often over ruled..
When ATC did the r/w inspections, there was very little delay...
but money talks....unfortunately.